test(lint): Replace ASCII-only check with ESLint rule

This replaces the `ensure-all-text-files-only-ascii` sanity-check
with an ESLint rule to only check identifiers in code against being
printable ASCII, as there are places where UTF-8 in content is required,
which would make the previous check fail.

Change-Type: patch

.eslintrc.yml

@@ -189,6 +189,9 @@ rules:
     - min: 2
       exceptions:
         - "_"
+  id-match:
+    - error
+    - "^[_0-9A-Za-z\\$]+$"
   line-comment-position:
     - error
     - position: above

Makefile

@@ -595,7 +595,6 @@ sanity-checks:
 	./scripts/ci/ensure-npm-valid-dependencies.sh
 	./scripts/ci/ensure-npm-shrinkwrap-versions.sh
 	./scripts/ci/ensure-all-file-extensions-in-gitattributes.sh
-	./scripts/ci/ensure-all-text-files-only-ascii.sh
 
 clean:
 	rm -rf $(BUILD_DIRECTORY)