refactor(@angular-devkit/schematics): initial isolated declarations t… #1700

Job	Run time
build	19s
lint	2m 10s
e2e_windows (windows-2025, 22, npm, 0)	1m 1s
e2e_windows (windows-2025, 22, npm, 3)	55s
e2e_windows (windows-2025, 22, npm, 1)	29s
e2e_windows (windows-2025, 22, esbuild, 0)	54s
e2e_windows (windows-2025, 22, npm, 5)	1m 24s
e2e_windows (windows-2025, 22, npm, 2)	1m 2s
e2e_windows (windows-2025, 22, npm, 4)	37s
e2e_windows (windows-2025, 22, esbuild, 1)	44s
e2e_windows (windows-2025, 22, esbuild, 4)	2m 4s
e2e_windows (windows-2025, 22, esbuild, 2)	30s
e2e_windows (windows-2025, 22, esbuild, 3)	30s
e2e_windows (windows-2025, 22, esbuild, 5)	2m 2s
publish-snapshots	0s
Browser Compatibility Tests	0s
test	0s
e2e	0s
e2e-package-managers	0s
e2e-snapshots	0s
	14m 41s

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