Make is_wellformed_tenure_*_block return Error and remove custom conversions

[jferrant]

I am investigating the conversion of ChainstateError::{Error variant} to ChainstateError::InvalidStacksBlock(String) and I noticed these is_wellformed_* fns were written with an empty error and were all being mapped to ChainstateError::InvalidStacksBlock(String) with slightly different String messages so I made them return a consistent InvalidStacksBlock error and removed some redundant checks in validate_transactions_static

[federico-stacks]

LGMT!

[Jiloc]

lgtm!

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.09%. Comparing base (c5cca10) to head (8aa9641).
⚠️ Report is 35 commits behind head on develop.

Files with missing lines	Patch %	Lines
stackslib/src/chainstate/nakamoto/mod.rs	81.39%	8 Missing ⚠️
contrib/stacks-inspect/src/lib.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6600      +/-   ##
===========================================
- Coverage    79.58%   79.09%   -0.50%     
===========================================
  Files          571      571              
  Lines       351593   351573      -20     
===========================================
- Hits        279823   278062    -1761     
- Misses       71770    73511    +1741     

Files with missing lines	Coverage Δ
...tackslib/src/chainstate/nakamoto/staging_blocks.rs	89.56% <ø> (+2.44%)	⬆️
stackslib/src/chainstate/nakamoto/tests/mod.rs	99.13% <100.00%> (+<0.01%)	⬆️
stackslib/src/net/tests/download/nakamoto.rs	95.57% <100.00%> (+0.18%)	⬆️
contrib/stacks-inspect/src/lib.rs	19.87% <0.00%> (+0.07%)	⬆️
stackslib/src/chainstate/nakamoto/mod.rs	83.49% <81.39%> (+0.31%)	⬆️

... and 57 files with indirect coverage changes

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.