Make TestPeer use TestChainstate internally

[jferrant]

Make TestPeer use TestChainstate underneath the hood and remove some duplication. I think a lot of tests could be updated to just use TestChainstate (a lot odn't seem to actually need a full TestPeer) but leaving for another PR.

[kantai]

This LGTM!

[kantai]

LGTM!

[codecov]

Codecov Report

❌ Patch coverage is 58.54943% with 1023 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.88%. Comparing base (33d7113) to head (3612582).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
stackslib/src/chainstate/tests/mod.rs	35.86%	245 Missing ⚠️
stackslib/src/net/tests/relay/epoch2x.rs	17.61%	145 Missing ⚠️
.../src/chainstate/stacks/tests/block_construction.rs	41.91%	115 Missing ⚠️
...tackslib/src/chainstate/stacks/boot/pox_3_tests.rs	41.50%	62 Missing ⚠️
stackslib/src/net/tests/download/epoch2x.rs	0.00%	60 Missing ⚠️
stackslib/src/chainstate/stacks/db/blocks.rs	47.11%	55 Missing ⚠️
stackslib/src/net/mod.rs	82.47%	41 Missing ⚠️
stackslib/src/net/tests/inv/epoch2x.rs	38.59%	35 Missing ⚠️
...tackslib/src/chainstate/stacks/boot/pox_4_tests.rs	85.71%	34 Missing ⚠️
stackslib/src/net/tests/download/nakamoto.rs	51.51%	32 Missing ⚠️
... and 16 more

❌ Your project status has failed because the head coverage (58.88%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (33d7113) and HEAD (3612582). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (33d7113)	HEAD (3612582)
	85	75

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6557      +/-   ##
===========================================
- Coverage    63.97%   58.88%   -5.10%     
===========================================
  Files          568      568              
  Lines       347131   347332     +201     
===========================================
- Hits        222090   204535   -17555     
- Misses      125041   142797   +17756     

Files with missing lines	Coverage Δ
stackslib/src/chainstate/nakamoto/mod.rs	79.40% <100.00%> (+0.50%)	⬆️
stackslib/src/clarity_vm/tests/ephemeral.rs	71.82% <100.00%> (+42.43%)	⬆️
stackslib/src/net/api/tests/getblock_v3.rs	73.62% <100.00%> (+50.54%)	⬆️
stackslib/src/net/api/tests/gettransaction.rs	86.04% <100.00%> (+72.09%)	⬆️
stackslib/src/net/api/tests/mod.rs	94.24% <100.00%> (+8.78%)	⬆️
stackslib/src/net/server.rs	74.44% <100.00%> (-1.62%)	⬇️
stackslib/src/net/tests/convergence.rs	70.94% <100.00%> (-7.68%)	⬇️
stackslib/src/net/api/tests/blockreplay.rs	23.91% <0.00%> (-16.31%)	⬇️
...ckslib/src/chainstate/stacks/boot/signers_tests.rs	73.58% <50.00%> (+10.00%)	⬆️
stackslib/src/net/api/tests/gettenure.rs	22.11% <0.00%> (-75.00%)	⬇️
... and 23 more

... and 395 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 33d7113...3612582. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.