Remove autogenerated files from versioning

[dricross]

Description of the issue

After running make test on a fresh repo, there will be some files that have been modified. These files are generated by certWatcher_test.go. They are used for the test and nothing else. They do not need to already exist for the test to pass. They do not need to be version controlled.

% git st
On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   internal/tls/testdata/server.crt
        modified:   internal/tls/testdata/server.key
        modified:   internal/tls/testdata/tls-ca.crt

no changes added to commit (use "git add" and/or "git commit -a")

Description of changes

Remove autogenerated files from version control and ignore the autogenerated files

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

make test - no more modified files

Requirements

Before commit the code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint

[Paramadon]

lgtm