Remove watch (#7048)

Removes the WIP chain indexer known as beacon watch.

Author: macladson

.github/workflows/test-suite.yml

@@ -24,8 +24,6 @@ env:
   LIGHTHOUSE_GITHUB_TOKEN: ${{ secrets.LIGHTHOUSE_GITHUB_TOKEN }}
   # Enable self-hosted runners for the sigp repo only.
   SELF_HOSTED_RUNNERS: ${{ github.repository == 'sigp/lighthouse' }}
-  # Self-hosted runners need to reference a different host for `./watch` tests.
-  WATCH_HOST: ${{ github.repository == 'sigp/lighthouse' && 'host.docker.internal' || 'localhost' }}
   # Disable incremental compilation
   CARGO_INCREMENTAL: 0
   # Enable portable to prevent issues with caching `blst` for the wrong CPU type