Update BlockParam nodeType to GlimmerBlockParam

ember-eslint-parser now uses GlimmerBlockParam (via ember-estree)
for consistency with all other Glimmer-prefixed node types.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: NullVoxPopuli

tests/lib/rules-preprocessor/gjs-gts-parser-test.js

@@ -283,7 +283,7 @@ const invalid = [
         line: 3,
         message: "'notUsed' is defined but never used.",
         messageId: 'unusedVar',
-        nodeType: 'BlockParam',
+        nodeType: 'GlimmerBlockParam',
         ruleId: 'no-unused-vars',
         severity: 2,
       },