Backport to 25.0: Support virtual filesystems without embedded Python virtual environment #242

Job	Run time
pre_commit	41s
build (macos-latest)	1m 16s
build (ubuntu-latest)	1m 14s
build (windows-latest)	59s
${{ matrix.tests }} (${{ matrix.os }})	0s
integration	0s
build (windows-latest)	2m 33s
pre_commit	41s
build (ubuntu-latest)	1m 14s
build (macos-latest)	1m 16s
${{ matrix.tests }} (${{ matrix.os }})	0s
integration	0s
build (ubuntu-latest)	3m 55s
build (macos-latest)	1m 16s
pre_commit	41s
build (windows-latest)	2m 33s
${{ matrix.tests }} (${{ matrix.os }})	0s
integration	0s
build (macos-latest)	5m 35s
build (windows-latest)	2m 33s
pre_commit	41s
build (ubuntu-latest)	3m 55s
integration (ubuntu-latest, test_gradle_plugin.py)	47m 6s
integration (ubuntu-latest, test_jbang_integration.py)	47m 2s
integration (macos-latest, test_jbang_integration.py)	16m 7s
integration (macos-latest, test_gradle_plugin.py)	21m 21s
integration (windows-latest, test_jbang_integration.py)	10m 30s
unit-cp (ubuntu-latest)	36m 47s
integration (macos-latest, test_maven_plugin.py)	36m 9s
integration (ubuntu-latest, test_maven_plugin.py)	1h 3m 28s
unit-mp (macos-latest)	2m 2s
integration (windows-latest, test_maven_plugin.py)	1h 5m 9s
unit-cp (macos-latest)	39m 25s
unit-it-mp (ubuntu-latest)	2m 25s
unit-it-mp (macos-latest)	3m 48s
unit-mp (windows-latest)	3m 28s
integration (windows-latest, test_gradle_plugin.py)	51m 55s
unit-mp (ubuntu-latest)	2m 25s
unit-it-mp (windows-latest)	3m 57s
unit-cp (windows-latest)	1h 31m 15s
isolate-it (ubuntu-latest)	2m 23s
	9h 37m 45s

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