ci: Make the mobile-cc CI job run on all Envoy changes

It's important for us to run the mobile C++ unit and integration tests
on any Envoy change. If we don't, we run the risk of breaking Envoy
Mobile with seemingly benign changes.

For example, envoyproxy#32775 caused Envoy
Mobile to permafail because an Envoy Mobile unit test wasn't run (see
envoyproxy#33158 for the fix).

This change ensures that the Envoy Mobile C++ tests run on all core
Envoy changes. There aren't too many of these tests, so it shouldn't add
much to the runtime of CI per PR.

Signed-off-by: Ali Beyad <abeyad@google.com>

.github/config.yml

@@ -208,14 +208,7 @@ run:
     - tools/code_format/check_format.py
   mobile-cc:
     paths:
-    - .bazelrc
-    - .bazelversion
-    - .github/config.yml
-    - bazel/external/quiche.BUILD
-    - bazel/repository_locations.bzl
-    - mobile/.bazelrc
-    - mobile/**/*
-    - tools/code_format/check_format.py
+    - "**/*"
   mobile-compile-time-cc:
     paths:
     - "**/*"