fix(cache): Ensure unique global prefix per instanceid

[SystemKeeper]

Summary

• Have 2 Nextcloud instances using the same PHP-FPM pool
• Ensure that both instances have the same version / apps
• Try to query capabilities, that are unique to both instance (e.g. talk signaling key)

Before this PR:
It's possible that instance 1 returns the key from instance 2 or vice versa

After this PR:
Key is correctly returned

• Related feat(AppConfig): cache the config if local cache is available #54383

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[SystemKeeper]

/backport to stable32

[fancycode]

Thanks, after applying the patch I can no longer reproduce the problem I had without it.

[fancycode]

lgtm

[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/55383/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 34a085d3

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/55383/stable32

Error: Failed to push branch backport/55383/stable32: remote: {"auth_status":"auth_error","body":"Invalid username or token. Password authentication is not supported for Git operations."}
fatal: Authentication failed for 'https://github.com/nextcloud/server.git/'

---

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

[susnux]

/backport to stable32

[nursoda]

Backlink to the same issue described in the forum.

[melroy89]

/backport to stable32

Yes please.

[SystemKeeper]

Yes please.

Already done :) the quote is a command to trigger the backport (#55386). It’s already merged and will be included in the next release

[melroy89]

Yes please.

Already done :) the quote is a command to trigger the backport (#55386). It’s already merged and will be included in the next release

Thank you so much 🥇 .. Hopefully I can switch back to APCu again then