test(functions): address PR feedback and fix test timeouts

[ncooke3]

• Refactored IntegrationTests.swift to use 'defer { expectation.fulfill() }' so that test failures correctly trigger XCTFail instead of causing obscure 10-second timeouts.
• Updated FunctionsStreamTests availability to macOS 12.0 and watchOS 8.0, and removed '#if !os(watchOS)' to resolve watchOS test failures.
• Wrapped agents.md intro to 80 chars and added a learning about preventing timeout masking in XCTest.

#no-changelog

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