Break the dependency between tests that use MessagingContext #84049

Job	Run time
Build framework (macos-release, -sdk macosx -configuration Release)	11m 39s
Build framework (macos-release, -sdk macosx -configuration Release)	11m 39s
Build framework (ios-release, -sdk iphoneos -configuration Release)	7m 20s
Build framework (ios-release, -sdk iphoneos -configuration Release)	7m 20s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	8m 53s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	8m 53s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	10m 18s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	10m 18s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	26m 11s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	26m 11s
Run framework tests (tsan, -enableThreadSanitizer YES)	33m 58s
Run framework tests (tsan, -enableThreadSanitizer YES)	31m 54s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	29m 29s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	29m 29s
	4h 13m 32s

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