[tests-only] update getPersonalSpaceIdForUser to use new oc:id format

[phil-davis]

Description

This PR makes the code more flexible in getPersonalSpaceIdForUser. It auto-detects if the space id is in base64-encoded format (the current "old" format) or in the proposed new unencoded format. So the tests will run auto-magically against cs3org/reva with either the old or proposed new format without needing to do anything special in CI.

This provides a way to transition to the proposed new format without breaking any CI.

Related Issue

reva PR cs3org/reva#2542

How Has This Been Tested?

CI
cs3org/reva#2550 - CI passes in reva master branch using the code here in this PR.
cs3org/reva#2551 - CI passes in reva edge branch using the code here in this PR.
cs3org/reva#2552 - CI passes in reva edge with the proposed "remove base64 encoding of ids" code from cs3org/reva#2542

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[micbar]

Awesome!

[phil-davis]

@micbar this code works with both versions of the space id. We could merge this to core, and then you can test and merge the space-id changes in reva whenever you like, without CI breaking.