[Auth] Make AuthBackend and related types Sendable #14125
Merged
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Addresses a couple places where AuthBackend is being sent across concurrency domains. The class is immutable and should be ok to mark Sendable. It does have a dependency on GTMSessionFetcher so preconcurrency imports are being used for those imports to suppress warnings that those type are not sendable.
e.g.
Sending 'backend' risks causing data races
#no-changelog