[cleanup] remove bellatrix from main paths

[michaelneuder]

📝 Summary

1. remove bellatrix logic from the main code paths. leaving the types alone for now to ensure any rollback is minimal and easy.
2. add todos where we will need to add deneb support

⛱ Motivation and Context

1. the bellatrix code is stale
2. this will help position us to get the deneb code in place asap

📚 References

#430

---

✅ I have run these commands

• make lint
• make test-race
• go mod tidy
• I have seen and agree to CONTRIBUTING.md

[codecov-commenter]

Codecov Report

Merging #436 (c4cf14f) into main (7fe4a70) will increase coverage by 0.20%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main     #436      +/-   ##
==========================================
+ Coverage   30.63%   30.84%   +0.20%     
==========================================
  Files          24       24              
  Lines        4661     4623      -38     
==========================================
- Hits         1428     1426       -2     
+ Misses       3040     3005      -35     
+ Partials      193      192       -1     

Flag	Coverage Δ
unittests	30.84% <0.00%> (+0.20%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
services/api/blocksim_ratelimiter.go	13.04% <ø> (+0.36%)	⬆️
services/api/service.go	34.75% <0.00%> (+0.61%)	⬆️

[metachris]

nice!