Expose Testing test identifier from test context #413

Job	Run time
Library evolution	27s
Examples (Debug)	4m 58s
macOS (debug, 15.4)	52s
Examples (Release)	6m 31s
Linux (debug)	52s
SwiftWasm (wasm-5.9.2-RELEASE)	44s
macOS (debug, 15.2)	1m 14s
Linux (release)	45s
SwiftWasm (wasm-5.10.0-RELEASE)	56s
macOS (release, 15.4)	38s
Windows (windows-latest, debug)	1m 49s
macOS (release, 15.2)	40s
Windows (windows-latest, release)	2m 16s
	22m 42s

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