refactor(@schematics/angular): use `generateFromFiles` helper in even… #1464

Job	Run time
lint	2m 21s
build	10s
e2e_windows (windows-2025, 22, npm, 1)	45s
e2e_windows (windows-2025, 22, esbuild, 3)	25s
e2e_windows (windows-2025, 22, npm, 2)	33s
e2e_windows (windows-2025, 22, esbuild, 5)	45s
e2e_windows (windows-2025, 22, esbuild, 4)	25s
e2e_windows (windows-2025, 22, esbuild, 1)	1m 5s
e2e_windows (windows-2025, 22, esbuild, 0)	24s
e2e_windows (windows-2025, 22, npm, 0)	34s
e2e_windows (windows-2025, 22, npm, 5)	32s
e2e_windows (windows-2025, 22, npm, 4)	37s
e2e_windows (windows-2025, 22, npm, 3)	35s
e2e_windows (windows-2025, 22, esbuild, 2)	37s
e2e-package-managers	0s
test	0s
Browser Compatibility Tests	0s
e2e	0s
publish-snapshots	0s
e2e-snapshots	0s
	9m 48s

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