Add utf-8 explicit charset meta tag to layouts #12489

Job	Run time
Build	2m 19s
Lint (rubocop)	1m 38s
Lint (erblint)	1m 21s
Test (unit_models)	3m 21s
Lint (dfe_analytics)	51s
Test (unit_services)	1m 24s
Lint (yarn_lint_and_test)	1m 5s
Test (unit_forms)	1m 12s
Test (unit_components)	1m 17s
Test (unit_other)	2m 6s
Test (integration_auth)	1m 6s
Test (integration_find)	1m 19s
Test (integration_publish)	2m 18s
Test (integration_support)	1m 18s
Test (integration_other)	1m 14s
Deployment To Review	2m 28s
Parallel deployment before production	0s
Production deployment	0s
Sandbox deployment	0s
	26m 17s

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