gh-108303: Move all inspect test files to `test_inspect/` #90708

Job	Run time
Check for source changes	10s
Ubuntu	12m 42s
Address sanitizer	12m 3s
macOS	9m 21s
Ubuntu SSL tests with OpenSSL (1.1.1w)	3m 52s
Windows (x64)	28m 10s
Ubuntu SSL tests with OpenSSL (3.0.11)	4m 2s
Windows (arm64)	4m 21s
Windows (x86)	25m 36s
Ubuntu SSL tests with OpenSSL (3.1.3)	3m 18s
Check if generated files are up to date	6m 3s
Docs	0s
CIFuzz	0s
Hypothesis tests on Ubuntu	6m 12s
All required checks pass	5s
	1h 55m 55s

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