fix(Token): add FILESYSTEM scope with SCOPE_SKIP_PASSWORD_VALIDATION

[blizzz]

• Resolves: [Bug]: SAML users without file access in 29.0.3rcX, 28.0.7rcX, 27.1.11rcX #46070

Summary

The scope design requires scopes to be either not specified, or
specified explicitely. Therefore, when setting the
skip-password-validation scope for user authentication from mechanisms
like SAML, we also have to set the filesystem scope, otherwise they will
lack access to the filesystem.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[blizzz]

/backport to stable29

[blizzz]

/backport to stable28

[blizzz]

/backport to stable27

[blizzz]

/backport to stable26

[backportbot]

The backport to stable26 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable26
git pull origin stable26

# Create the new backport branch
git checkout -b backport/46071/stable26

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 895ed634

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/46071/stable26

Error: 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 stable27 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable27
git pull origin stable27

# Create the new backport branch
git checkout -b backport/46071/stable27

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 895ed634

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/46071/stable27

Error: 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 stable28 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable28
git pull origin stable28

# Create the new backport branch
git checkout -b backport/46071/stable28

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 895ed634

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/46071/stable28

Error: 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 stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/46071/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 895ed634

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/46071/stable29

Error: No changes found in backport branch

---

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

[blizzz]

backports will not have the constant