refactor(@angular/build): update private exports to expose Diagnostic… #9333

Job	Run time
build	3m 23s
lint	1m 51s
build-e2e-windows	3m 45s
test	4m 26s
publish-snapshots	4m 24s
Browser Compatibility Tests	4m 22s
e2e-windows (windows-2025, 22, npm, 1)	4m 5s
e2e-windows (windows-2025, 22, npm, 3)	4m 4s
e2e-windows (windows-2025, 22, esbuild, 1)	4m 4s
e2e-windows (windows-2025, 22, npm, 0)	4m 4s
e2e-windows (windows-2025, 22, esbuild, 5)	4m 4s
e2e-windows (windows-2025, 22, esbuild, 3)	4m 5s
e2e-windows (windows-2025, 22, esbuild, 2)	4m 4s
e2e-windows (windows-2025, 22, esbuild, 4)	4m 5s
e2e-windows (windows-2025, 22, npm, 5)	4m 4s
e2e-windows (windows-2025, 22, esbuild, 0)	4m 5s
e2e-windows (windows-2025, 22, npm, 4)	4m 5s
e2e-windows (windows-2025, 22, npm, 2)	4m 4s
e2e	1s
e2e-snapshots	1s
e2e-package-managers	1s
	1h 11m 7s

Provide feedback