refactor(@angular/build): update private exports to expose Diagnostic… #9332

Job	Run time
build	3m 9s
lint	1m 50s
build-e2e-windows	3m 28s
test	4m 41s
Browser Compatibility Tests	4m 39s
publish-snapshots	4m 40s
e2e-windows (windows-2025, 22, npm, 3)	4m 20s
e2e-windows (windows-2025, 22, npm, 2)	4m 21s
e2e-windows (windows-2025, 22, npm, 1)	4m 22s
e2e-windows (windows-2025, 22, esbuild, 0)	4m 22s
e2e-windows (windows-2025, 22, npm, 0)	4m 26s
e2e-windows (windows-2025, 22, npm, 5)	4m 21s
e2e-windows (windows-2025, 22, npm, 4)	4m 10s
e2e-windows (windows-2025, 22, esbuild, 2)	4m 21s
e2e-windows (windows-2025, 22, esbuild, 3)	4m 21s
e2e-windows (windows-2025, 22, esbuild, 4)	4m 22s
e2e-windows (windows-2025, 22, esbuild, 5)	4m 22s
e2e-windows (windows-2025, 22, esbuild, 1)	4m 22s
e2e	1s
e2e-snapshots	1s
e2e-package-managers	1s
	1h 14m 40s

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