fix(file-provider): (Re)discover XPC service for restored (previously missing) domain

[claucambra]

Resolves

Likely fixes #10885

Summary

When restoring a domain, a domain can be recreated with a new identifier after the initial XPC connections were established. The client updates the stored identifier but does not rediscover and configure the new domain’s XPC service

This PR addresses this issue

Checklist

• Sign-off message is added to all commits.
• The commit messages are following The Conventional Commits specification.
• The commit history is clean with no merge commits.
  • How to rebase your commits
  • How to squash commits with rebase
• Uploaded screenshots from before and after for UI changes.
• Test(s) added to branch, with before/after results included in PR description, for performance improvements where applicable.
• Documentation has been updated or is not required.
• Backports requested where applicable (critical bugfixes).
• Labels added where applicable (bug/enhancement).
• Milestone added for target version.

AI (if applicable)

• The content of this PR was partly or fully generated using AI
  • I have read the guidelines for AI-assisted contributions.
  • I have read Nextcloud's AI Contribution Policy.

[mgallien]

/backport to stable-34.0 please

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[claucambra]

/backport to stable-35.0