Fix mempool admission for Nakamoto Blocks

[jferrant]

Changes
- added get_nakamoto_block_height to check against nakamoto_staging_blocks in chainstate
- first attempt to check against nakamoto before checking against regular stacks when retrieving the block height in admission check

• Remove PoisonMicroblock check and BadNonces recheck
• Add test to use the submit_tx rather than bypassing the admission checks.

Fixes #4148

[kantai]

LGTM -- just some small feedback.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (e716bb6) 21.11% compared to head (d28e4e9) 21.37%.

Files	Patch %	Lines
stackslib/src/chainstate/stacks/db/blocks.rs	57.14%	3 Missing ⚠️
testnet/stacks-node/src/mockamoto/tests.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #4149      +/-   ##
==========================================
+ Coverage   21.11%   21.37%   +0.26%     
==========================================
  Files         418      418              
  Lines      295286   295286              
==========================================
+ Hits        62338    63107     +769     
+ Misses     232948   232179     -769     

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[jcnelson]

Thanks for tackling this! Requesting that you simply delete the code that gets the staging block height, because PoisonMicroblock transactions and queries against unconfirmed microblocks simply don't exist in Nakamoto.

[kantai]

LGTM!