lib: support security prepare

[RafaelGSS]

I'm doing an experiment as part of my work on nodejs/security-wg#860 + upcoming security release.

I was talking with @BethGriggs and looks reasonable to generate the proposal PR for security releases using git node release --security --prepare 19.6.1.

Currently, git node land doesn't work for the private repo, so the workflow is:

1. Create the proposal branch (based on vX.X instead of staging)
2. Iterate open PRs (based on the given filter) and ask to amend them in the proposal
3. Proceed with the regular workflow (adjust the node_version, changelogs, ...)

Example:

➜  node-private (main) ../node-core-utils/bin/git-node.js release --prepare --security 20.2.1
   ⚠  Remote repository URL does not point to the expected repository nodejs/node
   ⚠  You are trying to create a new release proposal branch for v20, but you're checked out on main and not v20.x.
--------------------------------------------------------------------------------
   ℹ  Switch to `v20.x` with `git checkout v20.x` before proceeding.
--------------------------------------------------------------------------------
➜  node-private (main) git checkout v20.x 
Switched to branch 'v20.x'
Your branch is up to date with 'upstream/v20.x'.
➜  node-private (v20.x) ../node-core-utils/bin/git-node.js release --prepare --security 20.2.1
   ⚠  Remote repository URL does not point to the expected repository nodejs/node
⠙ Creating new proposal branch for 20.2.1Branch 'v20.2.1-proposal' set up to track remote branch 'v20.x' from 'origin'.
Switched to a new branch 'v20.2.1-proposal'
✔  Created new proposal branch for 20.2.1
✔  Done loading data for nodejs-private/node-private/pull/393
----------------------------------- PR info ------------------------------------
Title      SENSITIVE: INFORMATION (#393)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     tniessen:h1-XXXXX -> nodejs-private:main
Labels
Commits    1
 - sensitive: information
Committers 1
 - Tobias Nießen <tniessen@tnie.de>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs-private/node-private/pull/393
Fixes: X
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
--------------------------------------------------------------------------------
   ℹ  This PR was created on Thu, 23 Feb 2023 15:18:32 GMT
   ✔  Approvals: 3
   ✔  - Matteo Collina (@mcollina) (TSC): https://github.com/nodejs-private/node-private/pull/393#pullrequestreview-1352725924
   ✔  - Robert Nagy (@ronag) (TSC): https://github.com/nodejs-private/node-private/pull/393#pullrequestreview-1311573538
   ✔  - Rafael Gonzaga (@RafaelGSS) (TSC): https://github.com/nodejs-private/node-private/pull/393#pullrequestreview-1311635021
   ✖  Last GitHub CI failed
   ✖  No Jenkins CI runs detected
--------------------------------------------------------------------------------
? Would you like to amend this PR to the proposal? Yes
⠙ Downloading patch for 393From github.com:nodejs-private/node-private
 * branch                    refs/pull/393/merge -> FETCH_HEAD
✔  Fetched commits as 745083abb4a7..88b780e6e074
--------------------------------------------------------------------------------
[v20.2.1-proposal d79ce3ef3a4] sensitive: information
 Author: Tobias Nießen <tniessen@tnie.de>
 Date: Thu Feb 23 15:13:16 2023 +0000
 2 files changed, 43 insertions(+)
   ✔  Patches applied
--------------------------------------------------------------------------------
? Git found no CVE-ID trailer in the original commit message. Please, provide the CVE-ID CVE-2023-TEST123
--------------------------------- New Message ----------------------------------
sesntive: information

REMOVED DESCRIPTION.

Fixes: X
PR-URL: https://github.com/nodejs-private/node-private/pull/393
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
CVE-ID: CVE-2023-TEST123
--------------------------------------------------------------------------------
? Use this message? Yes

---

Limitations that should be addressed in subsequent PRs:

• Support multiple commits
• Public PRs (backports)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04 ⚠️

Comparison is base (51a3b24) 83.41% compared to head (baf8494) 83.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #665      +/-   ##
==========================================
- Coverage   83.41%   83.38%   -0.04%     
==========================================
  Files          37       37              
  Lines        4131     4158      +27     
==========================================
+ Hits         3446     3467      +21     
- Misses        685      691       +6     

Impacted Files	Coverage Δ
lib/collaborators.js	100.00% <100.00%> (ø)
lib/utils.js	65.15% <100.00%> (ø)

... and 4 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[RafaelGSS]

@nodejs/releasers just updated this PR.

Now it iterates over open PRs in the private repo and adds them to the proposal branch -- with the metadata. If the PR doesn't contain CVE-ID metadata, it will ask to include it in the middle of the process. Could you please review it?

[ruyadorno]

LGTM! A few details you might want to clean up before shipping (although I might just need clarification in a few places) 👍

Great work! Security releases are going to be much simpler 😊 🙏

[ruyadorno]

🎉