*: add --all for exit sign command

[KaloyanTanev]

Add --all command for signing partial exits. This PR is one of a couple incoming PRs that will be for the --all functionality. Mind that the CLI flag is not enabled until all of them are implemented and merged.

category: feature
ticket: #3243

[sonarcloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 58.88889% with 37 lines in your changes missing coverage. Please review.

Project coverage is 57.64%. Comparing base (af6f87b) to head (56ccaba).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/exit_sign.go	59.77%	27 Missing and 8 partials ⚠️
cmd/exit.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3272      +/-   ##
==========================================
- Coverage   57.68%   57.64%   -0.05%     
==========================================
  Files         211      211              
  Lines       30418    30478      +60     
==========================================
+ Hits        17547    17569      +22     
- Misses      10986    11014      +28     
- Partials     1885     1895      +10     

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[gsora]

Can we use signAllValidatorsExits here, and instead of passing all shares we pass a slice with the single share we're interested in?

[KaloyanTanev]

Yes, I've been thinking about that, but when we are signing for single validator we are checking the config if the user passed pubkey or index or both, in exit all scenario we don't have none of those. We can still use the same function for both cases, but I will have to add some flags and checks which to determine if we have to check the config or not. It will make the code less readable imo.