test: abandon proposal and extend when new burn block arrives

[brice-stacks]

A new integration test:

• Miner wins tenure N
• Miner mines tenure change block and one additional block in tenure N
• Block validation is paused so the next block proposal cannot be accepted yet
• Miner proposes block M
• Next burn block, N+1 arrives, with no block commits, so no sortition winner
• Unpause block validation, block M is accepted
• Miner mines tenure extend in block M+1

[brice-stacks]

Leaving this in draft until I add working variants of this test where:

1. Block M is rejected by signers
2. Block M doesn't reach consensus for either approval or rejection

[brice-stacks]

These tests all pass -- no troublesome scenarios discovered.

[hstove-stacks]

You have conflicts unfortunately, but LGTM!

[brice-stacks]

I merged in develop and just had to fix a conflict in stacks-node/src/tests/signer/v0.rs, due to both branches adding new tests. @hstove-stacks @aaronb-stacks

[codecov]

Codecov Report

❌ Patch coverage is 1.63399% with 301 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.17%. Comparing base (6116402) to head (d78d9e8).

Files with missing lines	Patch %	Lines
stacks-node/src/tests/signer/v0.rs	0.00%	296 Missing ⚠️
stacks-signer/src/v0/tests.rs	44.44%	5 Missing ⚠️

❌ Your project check has failed because the head coverage (73.17%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6767      +/-   ##
===========================================
- Coverage    77.52%   73.17%   -4.36%     
===========================================
  Files          582      582              
  Lines       361565   361871     +306     
===========================================
- Hits        280294   264786   -15508     
- Misses       81271    97085   +15814     

Files with missing lines	Coverage Δ
stacks-signer/src/v0/signer.rs	75.41% <100.00%> (-1.19%)	⬇️
stacks-signer/src/v0/tests.rs	83.48% <44.44%> (+3.48%)	⬆️
stacks-node/src/tests/signer/v0.rs	21.32% <0.00%> (+5.49%)	⬆️

... and 260 files with indirect coverage changes

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