[v18] Port gcp join method to new join service (#61205)
#61797
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Backport of #61205 for branch/v18
Retested against a Cloud tenant running this branch and a GCP VM:
gcpjoin method to new join serviceThis ports the
gcpjoin method to the new join service. It moves join-related code fromlib/gcptolib/join/gcp, extracts common joining logic tolib/join/gcpfor reuse between the legacy and new entrypoints, and adds a compatibility layer for use by the legacy client.See also: RFD 27e
Add GCP to new join service whitelist
Rename checkAndSetDefaults() to validate()