build: remove token validation tests (#29438)

Deletes the token validation tests since we're no longer looking to comply with the current token set.

Author: crisbeto

.ng-dev/google-sync-config.json

@@ -33,7 +33,6 @@
     "src/material/module.ts",
     "src/material/core/index.ts",
     "src/material/core/theming/tests/**/*",
-    "src/material/core/tokens/tests/**",
     "src/material/expansion/index.ts",
     "src/material-experimental/theming/_format-tokens.scss",
     "**/*import.scss"