refactor(@schematics/angular): remove manual install task in library … #1786

Job	Run time
build	14s
lint	2m 19s
e2e_windows (windows-2025, 22, npm, 1)	34s
e2e_windows (windows-2025, 22, npm, 3)	29s
e2e_windows (windows-2025, 22, npm, 0)	57s
e2e_windows (windows-2025, 22, npm, 5)	56s
e2e_windows (windows-2025, 22, npm, 2)	33s
e2e_windows (windows-2025, 22, npm, 4)	35s
e2e_windows (windows-2025, 22, esbuild, 0)	49s
e2e_windows (windows-2025, 22, esbuild, 2)	3m 4s
e2e_windows (windows-2025, 22, esbuild, 5)	35s
e2e_windows (windows-2025, 22, esbuild, 3)	30s
e2e_windows (windows-2025, 22, esbuild, 4)	42s
e2e_windows (windows-2025, 22, esbuild, 1)	30s
test	0s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e-snapshots	0s
e2e-package-managers	0s
e2e	0s
	12m 47s

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