ci: move clang-tidy build to GCB

[coryan]

No description provided.

[codecov]

Codecov Report

Merging #392 (d94f494) into main (a47af20) will not change coverage.
The diff coverage is 77.77%.

❗ Current head d94f494 differs from pull request most recent head 9f969b6. Consider uploading reports for the commit 9f969b6 to get more accurate results

@@           Coverage Diff           @@
##             main     #392   +/-   ##
=======================================
  Coverage   89.20%   89.20%           
=======================================
  Files          97       97           
  Lines        3140     3140           
=======================================
  Hits         2801     2801           
  Misses        339      339           

Impacted Files	Coverage Δ
...les/site/testing_pubsub/pubsub_integration_test.cc	83.33% <ø> (ø)
examples/site/testing_pubsub/pubsub_system_test.cc	0.00% <ø> (ø)
examples/site/testing_pubsub/pubsub_unit_test.cc	100.00% <ø> (ø)
...s/site/testing_storage/storage_integration_test.cc	78.57% <ø> (ø)
examples/site/testing_storage/storage_unit_test.cc	100.00% <ø> (ø)
examples/site/tips_gcp_apis/tips_gcp_apis.cc	29.16% <0.00%> (ø)
...tutorial_cloud_bigtable/tutorial_cloud_bigtable.cc	0.00% <0.00%> (ø)
examples/site_test.cc	98.86% <ø> (ø)
...tions/integration_tests/cloud_event_conformance.cc	95.83% <ø> (ø)
...oud/functions/internal/parse_cloud_event_legacy.cc	95.94% <ø> (ø)
... and 6 more

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