test: update E2E tests to account for .ng.html template extension #688

Job	Run time
list	39s
workflow (build-cli)	2m 2s
workflow (modules-builder-tests)	2m 23s
workflow (devkit-core-tests)	1m 59s
workflow (devkit-core-tests-rerun)	1m 51s
workflow (build-unit-tests)	3m 6s
	12m 0s

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