add copywrite file that excludes .tf extension (#33012)

.copywrite.hcl

@@ -0,0 +1,13 @@
+schema_version = 1
+
+project {
+  license        = "MPL-2.0"
+  copyright_year = 2014
+
+  # (OPTIONAL) A list of globs that should not have copyright/license headers.
+  # Supports doublestar glob patterns for more flexibility in defining which
+  # files or folders should be ignored
+  header_ignore = [
+    "**/*.tf",
+  ]
+}