test

Add FirebaseAuth identity token #602

Job	Run time
linux-integration	3m 56s
unit-tests / ios-unit	1m 41s
unit-tests / lint	40s
unit-tests / linux-unit (swift:5.9-jammy)	26s
unit-tests / api-breakage	1m 58s
unit-tests / linux-unit (swift:5.10-noble)	30s
unit-tests / macos-unit (macos-13, ~15.2)	15s
unit-tests / musl	1m 46s
unit-tests / macos-unit (macos-14, latest-stable)	1m 18s
unit-tests / linux-unit (swift:6.0-noble)	1m 40s
unit-tests / windows-unit (6)	3m 58s
unit-tests / linux-unit (swiftlang/swift:nightly-main-jammy)	2m 5s
	20m 13s

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