Filter internal tests watch permission warning

[clockwork-labs-bot]

Description of Changes

Filter the noisy gh run watch annotation-permission warning from the public Internal Tests workflow when it waits for the dispatched private CI run:

requesting annotations returned 403 Forbidden as the token does not have sufficient permissions

The workflow still exits with the original gh run watch status, so failed private runs continue to fail the public check.

API and ABI breaking changes

None.

Expected complexity level and risk

1. Small CI log filtering change.

Testing

• ruby -e 'require "yaml"; YAML.load_file(".github/workflows/internal-tests.yml"); puts "ok"'
• git diff --check
• Local bash sanity check that the filter removes the noisy line and preserves the watched command status.

[bfops]

LGTM