cmd: skip inactive validators in exits

[KaloyanTanev]

This PR solves 2 issues:

1. Upon signing exits for all validators, Charon does not check if all validators are active. We are changing that to sign only exits for validators that are either queued for activation or active.
2. Upon broadcasting exits for all validators, Charon does not check if all validators are active. We are changing that to broadcast only exits for validators that are active.

category: bug
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[pinebit]

sad we don't update tests, but I assume this is because of urgency

[DiogoSantoss]

How bad is signing exits for validators which are not active yet ? Asking because I remember we had issues with head not having the most up to date state and returning stale validator state. Although this was only occurred when asking close to the activation epoch so maybe not relevant.

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.00%. Comparing base (af593ee) to head (8ae0ee2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/exit_broadcast.go	57.14%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4205   +/-   ##
=======================================
  Coverage   57.00%   57.00%           
=======================================
  Files         237      237           
  Lines       30601    30623   +22     
=======================================
+ Hits        17443    17456   +13     
  Misses      10938    10938           
- Partials     2220     2229    +9     

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[OisinKyne]

How bad is signing exits for validators which are not active yet ?

You cannot sign a valid exit for a validator until it has an index assigned (meaning its in the activation queue at least). You cannot broadcast a valid exit until the validator has been active for at least 27 hours.