PR #6290 blacklisted a number of conformance tests because we do not currently support the usecases they support:

• get-* tests (because we use BatchGetDocuments API rather than the GetDocument API.
• listen-* tests exercise the "watch" features (since landed in PR Firestore: add Watch Support #6191).
• update_paths-* tests (they've been excluded forever, with a note that Python lacked the support).
• Tests involving unimplemented / incorrectly implemented "transforms" (DELETE, ARRAY_REMOVE, ARRAY_UNION).
• query-* tests have been (inadvertently) skipped since being copied in from google-cloud-common in PR Re-sync with .proto / .textproto files from google-cloud-common. #5351).

This is a tracking issue for removing those skips / blacklist entries:

• Update Document.get to use the GetDocument API, and re-enable the (one) get-basic.textproto test. (Firestore: refactor 'Document.get' to use the 'GetDocument' API. #6534)
• Fix the support for the DELETE transform (one failing test) and enable those tests. (Firestore: fix delete conformance #6559)
• Figure out how to support the ARRAY_REMOVE transform, and enable those tests. (Firestore: add support for 'ArrayRemove' / 'ArrayUnion' transforms #6651)
• Figure out how to support the ARRAY_UNION transform, and enable those tests. (Firestore: add support for 'ArrayRemove' / 'ArrayUnion' transforms #6651)
• Enable the query-* tests and make changes needed for them to pass. (Firestore: add driver for query conformance tests. #6839)
• Enable the listen-* tests and make changes needed for them to pass. (Firestore: implement listen conformance #6935)

Not in scope:

- Figure how to support the "update with paths" use case, and enable those tests.