add: compute_columns_for_custody_group tests

[agnxsh]

https://github.com/ethereum/consensus-spec-tests/tree/v1.5.0-beta.0/tests/mainnet/fulu/networking/compute_columns_for_custody_group/pyspec_tests

[github-actions]

Unit Test Results

       12 files  ±  0    1 826 suites  ±0   56m 24s ⏱️ - 1m 23s
  5 358 tests +10    5 011 ✔️ +10  347 💤 ±0  0 ❌ ±0 
29 589 runs  +20  29 145 ✔️ +20  444 💤 ±0  0 ❌ ±0 

Results for commit 0761126. ± Comparison against base commit 4f161e7.

♻️ This comment has been updated with latest results.

[tersec]

https://ci.status.im/blue/organizations/jenkins/nimbus-eth2%2Fplatforms%2Fmacos%2Faarch64%2Fmain/detail/PR-6838/6/pipeline

[2025-01-11T03:02:26.142Z] + git diff --exit-code --ignore-submodules=all
[2025-01-11T03:02:26.142Z] diff --git a/AllTests-mainnet.md b/AllTests-mainnet.md
[2025-01-11T03:02:26.142Z] index 5801f875..592997cf 100644
[2025-01-11T03:02:26.142Z] --- a/AllTests-mainnet.md
[2025-01-11T03:02:26.142Z] +++ b/AllTests-mainnet.md
[2025-01-11T03:02:26.142Z] @@ -1154,4 +1154,4 @@ OK: 2/2 Fail: 0/2 Skip: 0/2
[2025-01-11T03:02:26.142Z]  OK: 9/9 Fail: 0/9 Skip: 0/9
[2025-01-11T03:02:26.142Z]  
[2025-01-11T03:02:26.142Z]  ---TOTAL---
[2025-01-11T03:02:26.142Z] -OK: 782/787 Fail: 0/787 Skip: 5/787
[2025-01-11T03:02:26.142Z] +OK: 783/788 Fail: 0/788 Skip: 5/788
script returned exit code 1

needs another make test or similar pass