Make DKG fully robust against non-participation

[xoloki]

Description

Applicable issues

• fixes [Nakamoto] Stacker-Signer binary must handle non-participation #4111

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo
• New integration test(s) added to bitcoin-tests.yml

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f359a17) 83.20% compared to head (b745833) 83.20%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #4236   +/-   ##
=======================================
  Coverage   83.20%   83.20%           
=======================================
  Files         432      432           
  Lines      306549   306549           
=======================================
  Hits       255066   255066           
  Misses      51483    51483           

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[kantai]

This looks like just an update to a rustdoc -- which is fine with me, but is this PR missing a commit?

[xoloki]

This looks like just an update to a rustdoc -- which is fine with me, but is this PR missing a commit?

This PR is a placeholder until we publish wsts 7.0, which should happen tomorrow. I originally created it to test whether CI was working on the next branch for @jferrant