fix: sessions flakes

[ncooke3]

The flakes are most likely due to:

firebase-ios-sdk/FirebaseSessions/Sources/FirebaseSessions.swift

Line 182 in 54a9296

all(self.subscriberPromises.values).then(on: .global(qos: .background)) { _ in

May need to mirror the approach from #15623

#no-changelog

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[ncooke3]

/gemini review

[gemini-code-assist]

Code Review

This pull request aims to fix flaky tests by adding sync blocks to wait for background queue operations. The approach is sound and should improve test stability. The added block in setUp() correctly isolates tests by draining the queue from previous runs. I've added one comment on the second added block in runSessionsSDK() to suggest improving a comment for clarity and to point out code duplication that could be refactored.