fix(@angular/ssr): introduce trustProxyHeaders option to safely vali… #2991

Job	Run time
lint	2m 7s
build-e2e-windows	24s
build	34s
e2e-windows	-1s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e-snapshots	0s
test	0s
e2e	0s
e2e-package-managers	0s
	3m 4s

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