Add CI job to check for deleted files

[michaelsproul]

Add a job to CI that checks for deleted files which have accidentally been re-added. It seems that every time we delete a major component, it inevitably gets brought back from the dead by a merge conflict.

e.g.

The OTB verification service was deleted here:

• Delete OTB verification service #6631

Then re-added here:

• Integrate tracing #6339

Then re-deleted here:

• Remove merge transition code #8761

The same thing happened with PartialBeaconState recently too.

Additional Info

Adding to .gitignore isn't strong enough, as git will still try to resolve conflicts for files that are on one branch and ignored on the other.

[michaelsproul]

Expecting this to fail (due to OTB) until Lion's PR is merged.

[mergify]

Some required checks have failed. Could you please take a look @michaelsproul? 🙏

[dapplion]

Will we remember to add new deleted files in this list?

[michaelsproul]

I will 😁

[michaelsproul]

At least it's easier than remembering to check every PR for random files coming back from the dead

[michaelsproul]

Another candidate:

• beacon_node/store/src/consensus_context.rs

[mergify]

Merge Queue Status

Rule: default

---

• ✅ Entered queue — 2026-02-26 20:32 UTC
• ✅ Checks passed · on draft merge queue: embarking unstable (a1ef265) and #8727 together #8908
• ✅ Merged — 2026-02-26 21:05 UTC · at 409c650bd55e4952ac6b7b8a8e69c3368e504b66

This pull request spent 33 minutes 2 seconds in the queue, including 30 minutes 47 seconds running CI.

Required conditions to merge

• check-success=local-testnet-success
• check-success=test-suite-success