exclude tsx test and mock files from test coverage (#109203)

packages/kbn-test/jest-preset.js

@@ -104,10 +104,10 @@ module.exports = {
   collectCoverageFrom: [
     '**/*.{js,mjs,jsx,ts,tsx}',
     '!**/{__test__,__snapshots__,__examples__,*mock*,tests,test_helpers,integration_tests,types}/**/*',
-    '!**/*mock*.ts',
-    '!**/*.test.ts',
+    '!**/*mock*.{ts,tsx}',
+    '!**/*.test.{ts,tsx}',
     '!**/*.d.ts',
-    '!**/index.{js,ts}',
+    '!**/index.{js,ts,tsx}',
   ],
 
   // A custom resolver to preserve symlinks by default