Enh add UUID validaton/enforcement for contentcontainer, file, space and user

[martin-rueegg]

This PR enforces a valid UUID for guid column for contentcontainer, file, space and user. Currently arbitrary and non-unique string values up to 45 chars are allowed. This can lead to potential conflicts.

PR Admin

What kind of change does this PR introduce?

• Feature

Does this PR introduce a breaking change?

• Yes

If yes, please describe the impact and migration path for existing applications:

guid column for contentcontainer, file, space and user are now enforced to be valid UUIDs.

The PR fulfills these requirements

• It's submitted to the develop branch
• When resolving a specific issue, it's referenced in the PR's description (e.g. Fix #xxx[,#xxx], where "xxx" is the Github issue number)
• All tests are passing
• New/updated tests are included
• Changelog was modified
• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

[martin-rueegg]

Sorry, duplicate of

• Enh: Apply UUID validator #6587