fix(@angular/build): setup unit-test polyfills before TestBed init #434

Job	Run time
build	10s
lint	2m 19s
e2e_windows (windows-2025, 22, npm, 0)	25s
e2e_windows (windows-2025, 22, npm, 2)	28s
e2e_windows (windows-2025, 22, npm, 3)	1m 5s
e2e_windows (windows-2025, 22, npm, 4)	54s
e2e_windows (windows-2025, 22, npm, 5)	53s
e2e_windows (windows-2025, 22, npm, 1)	30s
e2e_windows (windows-2025, 22, esbuild, 0)	31s
e2e_windows (windows-2025, 22, esbuild, 2)	35s
e2e_windows (windows-2025, 22, esbuild, 5)	29s
e2e_windows (windows-2025, 22, esbuild, 1)	57s
e2e_windows (windows-2025, 22, esbuild, 3)	25s
e2e_windows (windows-2025, 22, esbuild, 4)	49s
test	0s
publish-snapshots	0s
e2e-package-managers	0s
Browser Compatibility Tests	0s
e2e	0s
e2e-snapshots	-1s
	10m 29s

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