fix(@angular/build): perform testing module cleanup when using Vitest #1535

Job	Run time
lint	2m 10s
build	14s
e2e_windows (windows-2025, 22, npm, 3)	39s
e2e_windows (windows-2025, 22, npm, 2)	39s
e2e_windows (windows-2025, 22, npm, 5)	1m 3s
e2e_windows (windows-2025, 22, esbuild, 0)	38s
e2e_windows (windows-2025, 22, npm, 4)	37s
e2e_windows (windows-2025, 22, esbuild, 1)	58s
e2e_windows (windows-2025, 22, esbuild, 2)	59s
e2e_windows (windows-2025, 22, npm, 1)	56s
e2e_windows (windows-2025, 22, npm, 0)	37s
e2e_windows (windows-2025, 22, esbuild, 3)	1m 8s
e2e_windows (windows-2025, 22, esbuild, 5)	49s
e2e_windows (windows-2025, 22, esbuild, 4)	35s
test	0s
Browser Compatibility Tests	0s
publish-snapshots	0s
e2e-package-managers	0s
e2e-snapshots	0s
e2e	0s
	12m 2s

Provide feedback