Remove `escapeExpression` from `@ember/template` #10858

Job	Run time
Linting	53s
Type Checking (current version)	58s
Basic Test	1m 26s
Blueprint Tests	0s
Type Checking (other supported versions) (5.3)	1m 1s
Type Checking (other supported versions) (5.0)	1m 2s
Type Checking (other supported versions) (5.1)	1m 11s
Type Checking (other supported versions) (5.7)	1m 2s
Type Checking (other supported versions) (5.2)	1m 2s
Type Checking (other supported versions) (5.4)	1m 2s
Type Checking (other supported versions) (5.5)	1m 7s
Type Checking (other supported versions) (5.6)	1m 1s
Publish alpha from default branch	0s
Smoke tests (Full Ember Apps)	0s
Deploy tags to npm	0s
Publish channel to s3	-1s
Notify Discord	-1s
Browser Tests (Firefox)	-1s
Browserstack Tests (Safari, Edge)	-1s
matrix.name	-1s
Node.js Tests	-1s
	11m 39s

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