feat: add py_image_layer (#402) #1357

Job	Run time
verify-bcr-patches	2s
test / matrix-prep-os	1s
test / matrix-prep-bazelversion	2s
test / test (ubuntu-latest, 7.1.0, ., false)	10m 36s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	5m 42s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	3m 0s
test / test (ubuntu-latest, 7.1.0, e2e/repository-rule-deps, true)	5m 28s
test / test (ubuntu-latest, 7.1.0, e2e/system-interpreter, true)	5m 25s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	30s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	5m 25s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 58s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	5m 52s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	6m 14s
test / test (macos-latest, 7.1.0, ., false)	15m 33s
test / test (macos-latest, 7.1.0, e2e/smoke, true)	5m 35s
test / test (macos-latest, 7.1.0, e2e/smoke, false)	3m 37s
test / test (macos-latest, 7.1.0, e2e/repository-rule-deps, true)	5m 19s
test / test (macos-latest, 7.1.0, e2e/system-interpreter, true)	5m 43s
test / test (macos-latest, 7.1.0, examples/uv_pip_compile, true)	41s
test / test (macos-latest, 6.4.0, e2e/smoke, true)	5m 46s
test / test (macos-latest, 6.4.0, e2e/smoke, false)	3m 32s
test / test (macos-latest, 6.4.0, e2e/repository-rule-deps, true)	8m 10s
test / test (macos-latest, 6.4.0, e2e/system-interpreter, true)	8m 14s
	1h 53m 25s

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