Deprecate implicit this property lookup fallback
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Lands the deprecation proposed in [emberjs/rfcs#308](https://github.com/emberjs/rfcs/blob/master/text/0308-deprecate-property-lookup-fallback.md): The [no-implicit-this](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-implicit-this.md) template linting rule has been enabled for Ember applications by default since around Ember 3.16 (included in the `octane` preset). This PR will take that a step further and issue a deprecation for templates that are still using `{{foo}}` to mean `{{this.foo}}`. Note: It does provide for an easy way to temporarily disable the deprecation messages (e.g. to reduce console output to hone in on other issues). This is intended for sporadic usage while debugging **not** as a way to mitigate the deprecation (the fallback behavior will be removed in 4.0.0).
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Lands the deprecation proposed in emberjs/rfcs#308:
The no-implicit-this template linting rule has been enabled for Ember applications by default since around Ember 3.16 (included in the
octanepreset).This PR will take that a step further and issue a deprecation for templates that are still using
{{foo}}to mean{{this.foo}}.Note: It does provide for an easy way to temporarily disable the deprecation messages (e.g. to reduce console output to hone in on other issues). This is intended for sporadic usage while debugging not as a way to mitigate the deprecation (the fallback behavior will be removed in 4.0.0).