Add utf-8 explicit charset meta tag to layouts #12490

Job	Run time
Build	2m 47s
Lint (rubocop)	1m 33s
Test (unit_models)	3m 30s
Lint (erblint)	1m 26s
Test (unit_services)	1m 24s
Lint (dfe_analytics)	51s
Test (unit_forms)	1m 9s
Lint (yarn_lint_and_test)	1m 1s
Test (unit_components)	1m 12s
Test (unit_other)	2m 12s
Test (integration_auth)	1m 11s
Test (integration_find)	1m 19s
Test (integration_publish)	2m 8s
Test (integration_support)	1m 21s
Test (integration_other)	1m 13s
Deployment To Review	5m 45s
Parallel deployment before production	0s
Production deployment	0s
Sandbox deployment	0s
	30m 2s

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