fix(@angular/build): ensure relative karma stack traces for test fail… #1390

Job	Run time
lint	2m 1s
build	12s
e2e_windows (windows-2025, 22, npm, 0)	1m 7s
e2e_windows (windows-2025, 22, npm, 1)	38s
e2e_windows (windows-2025, 22, npm, 2)	52s
e2e_windows (windows-2025, 22, npm, 3)	36s
e2e_windows (windows-2025, 22, npm, 4)	1m 3s
e2e_windows (windows-2025, 22, npm, 5)	1m 9s
e2e_windows (windows-2025, 22, esbuild, 0)	34s
e2e_windows (windows-2025, 22, esbuild, 1)	35s
e2e_windows (windows-2025, 22, esbuild, 2)	45s
e2e_windows (windows-2025, 22, esbuild, 3)	1m 2s
e2e_windows (windows-2025, 22, esbuild, 4)	47s
e2e_windows (windows-2025, 22, esbuild, 5)	37s
test	0s
Browser Compatibility Tests	0s
publish-snapshots	0s
e2e-package-managers	0s
e2e	0s
e2e-snapshots	0s
	11m 58s

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