fix(developers): No relative links in notifications

[nickvergessen]

☑️ Resolves

• Ref fix(notifications): Require absolute links for support of desktop and mobile clients server#59606

🖼️ Screenshots

[miaulalala]

/backport to stable33

[miaulalala]

/backport to stable32

[backportbot]

The backport to stable32 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable32
git pull origin stable32

# Create the new backport branch
git checkout -b backport/14304/stable32

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 0d8ccdf1

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/14304/stable32

Error: Failed to check for changes with origin/stable32: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable33 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable33
git pull origin stable33

# Create the new backport branch
git checkout -b backport/14304/stable33

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 0d8ccdf1

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/14304/stable33

Error: Failed to check for changes with origin/stable33: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.