fix(@angular/build): normalize karma asset paths before lookup #7537

Job	Run time
lint	21s
build	13s
e2e_windows (windows-2025, 22, npm, 0)	5s
e2e_windows (windows-2025, 22, npm, 1)	9s
e2e_windows (windows-2025, 22, npm, 2)	6s
e2e_windows (windows-2025, 22, npm, 3)	1s
e2e_windows (windows-2025, 22, npm, 4)	6s
e2e_windows (windows-2025, 22, npm, 5)	7s
e2e_windows (windows-2025, 22, esbuild, 0)	7s
e2e_windows (windows-2025, 22, esbuild, 1)	14s
e2e_windows (windows-2025, 22, esbuild, 2)	6s
e2e_windows (windows-2025, 22, esbuild, 3)	6s
e2e_windows (windows-2025, 22, esbuild, 4)	9s
e2e_windows (windows-2025, 22, esbuild, 5)	15s
test	1s
Browser Compatibility Tests	1s
publish-snapshots	1s
e2e	1s
e2e-package-managers	1s
e2e-snapshots	1s
	2m 11s

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