fix(@angular/build): exclude all entrypoints of a library from prebun… #1362

Job	Run time
build	11s
lint	2m 40s
e2e_windows (windows-2025, 22, npm, 0)	30s
e2e_windows (windows-2025, 22, npm, 1)	58s
e2e_windows (windows-2025, 22, npm, 2)	59s
e2e_windows (windows-2025, 22, npm, 3)	1m 24s
e2e_windows (windows-2025, 22, npm, 4)	1m 6s
e2e_windows (windows-2025, 22, npm, 5)	59s
e2e_windows (windows-2025, 22, esbuild, 0)	40s
e2e_windows (windows-2025, 22, esbuild, 1)	31s
e2e_windows (windows-2025, 22, esbuild, 2)	43s
e2e_windows (windows-2025, 22, esbuild, 3)	42s
e2e_windows (windows-2025, 22, esbuild, 4)	26s
e2e_windows (windows-2025, 22, esbuild, 5)	30s
test	0s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e-package-managers	0s
e2e-snapshots	0s
e2e	0s
	12m 19s

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