test

Add FirebaseAuth identity token #603

Job	Run time
linux-integration	3m 46s
unit-tests / ios-unit	1m 34s
unit-tests / api-breakage	1m 57s
unit-tests / lint	37s
unit-tests / linux-unit (swift:5.9-jammy)	28s
unit-tests / linux-unit (swift:5.10-noble)	29s
unit-tests / linux-unit (swift:6.0-noble)	1m 51s
unit-tests / macos-unit (macos-13, ~15.2)	12s
unit-tests / linux-unit (swiftlang/swift:nightly-main-jammy)	2m 17s
unit-tests / macos-unit (macos-14, latest-stable)	1m 18s
unit-tests / musl	1m 48s
unit-tests / windows-unit (6)	4m 15s
	20m 32s

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