[tests-only] [full-ci] Add examples of more username combinations

[phil-davis]

Description

Some test scenario examples in coreApiTrashbin/trashbinFilesFolders.feature used usernames that are just numbers: 123, -123, 0.0
Those examples were failing because a username like that cannot be created. So as part of PR #6270 those examples are being removed.

This PR adds some examples to createUser.feature for:

• username with letters and numbers (works)
• username with letters and dots (works)
• username is only digits (cannot be created)
• username is 0.0 (looks like a float) (cannot be created)

This will help "document" which usernames can and cannot be created in a default installation.

See doc issue owncloud/docs-ocis#495 - it seems that this is configurable with GRAPH_USERNAME_MATCH=none so the default behavior here is expected.

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• 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:

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[SwikritiT]

LGTM