graph: expose @libre.graph.shareTypes on driveItems

[dschmidt]

Stacked on #3437 (pendingOperations), implements opencloud-eu/libre-graph-api#58.

driveItems can carry @libre.graph.shareTypes, listing the kinds of shares that exist on an item so a listing can render share indicators without expanding permissions. Replaces oc:share-types from WebDAV PROPFIND for Graph listings.

user and group come from the storage grants, which the provider only reports when share-types is in the field mask; link has to be reassembled from the public share manager, one filter per item. Both are only done when the annotation is requested via $select, mirroring WebDAV, where oc:share-types is in requiresExplicitFetching and never part of an allprop response. A failing public share lookup costs the link type, not the response.

remote is in the spec enum but never emitted, ocdav does not report federated shares as a share type either.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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0 new issues

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🟢 Metrics 17 complexity

Metric	Results
Complexity	17

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🟢 Coverage 81.97% diff coverage · +0.03% coverage variation

Metric	Results
Coverage variation	✅ +0.03% coverage variation (-1.00%)
Diff coverage	✅ 81.97% diff coverage

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Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (61037cc)	88237	20687	23.44%
Head commit (aa968ec)	88294 (+57)	20731 (+44)	23.48% (+0.03%)

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 (#3438)	61	50	81.97%

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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