feat(ocm): split ocm discovery and capacities

[ArtificialOwl]

• move discovery out of capacities,
• heavy process are only run on ocm discovery
• should fix [Bug]: NC31 logs "Capabilities of OCA\\CloudFederationAPI\\Capabilities took 0.xx seconds to generate" on every page refresh. #51621

[ArtificialOwl]

red test not related

[ArtificialOwl]

/backport to stable31

[ArtificialOwl]

(rebased + conflict fix)

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/54385/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick fa60488e

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/54385/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

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