[tests-only] enhance theWebdavChecksumShouldMatch test

[phil-davis]

Description

https://drone.owncloud.com/owncloud/ocis/8908/23/6 fails with:
Warning: Illegal string offset 'value' in /srv/app/testrunner/tests/acceptance/features/bootstrap/ChecksumContext.php line 204

1. The PROPFIND response does not have the expected structure. The test code assumes that the deep array structure of the PROPFIND will all exist, and that it will be able to directly find the checksum.

This PR enhances the test code so that it checks at every level of the expected structure and fails with a message as soon as it discovers part of the nested structure does not exist.

2. some tests were added to core for "deep move" in PR [tests-only] Test moving a folder into a sub-folder of itself #39705 - those need to be skipped when testing against an "old" oC10, because the fix is only in master, not in 10.9.1 release or earlier.

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)
• 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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