tests: add acceptance tests for sharing with guests via email

[v-scharf]

Adds the apiGuestLink suite: shares a resource with an email address via the sharingNg API and accesses it with the guest link from the email. Inviting a guest to a whole project space is listed as an expected failure, auth-guest does not handle the SpaceShared event yet.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Coverage ∅ diff coverage · -0.02% coverage variation

Metric	Results
Coverage variation	✅ -0.02% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0deb118)	92312	23435	25.39%
Head commit (227348f)	92312 (+0)	23421 (-14)	25.37% (-0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3751)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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