auto-fix lint rule for missing template imports

[ef4]

This branch lets you try out ember-cli/eslint-plugin-ember#2272

It's configured to have an auto-fixable lint for a missing eq import in .gts files in host.

[github-actions]

Host Test Results

  1 files  ±0    1 suites  ±0   28m 39s ⏱️ +37s
839 tests ±0  835 ✅ ±0  4 💤 ±0  0 ❌ ±0 
844 runs  ±0  840 ✅ ±0  4 💤 ±0  0 ❌ ±0 

Results for commit d121938. ± Comparison against base commit 8e1fed4.