[WIP] refactor: make the test observer instantiable instead of a singleton

[benjamin-stacks]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 6.85118% with 2053 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.58%. Comparing base (3d27a91) to head (17e0f3e).

Files with missing lines	Patch %	Lines
stacks-node/src/tests/signer/v0/reorg.rs	0.00%	419 Missing ⚠️
stacks-node/src/tests/signer/v0/mod.rs	0.00%	380 Missing ⚠️
stacks-node/src/tests/nakamoto_integrations.rs	0.00%	309 Missing ⚠️
stacks-node/src/tests/test_observer.rs	34.18%	285 Missing ⚠️
stacks-node/src/tests/signer/v0/tenure_extend.rs	0.00%	271 Missing ⚠️
stacks-node/src/tests/neon_integrations.rs	2.54%	115 Missing ⚠️
stacks-node/src/tests/epoch_21.rs	0.00%	76 Missing ⚠️
stacks-node/src/tests/signer/v0/tx_replay.rs	0.00%	72 Missing ⚠️
...tacks-node/src/tests/signer/commands/block_wait.rs	0.00%	47 Missing ⚠️
stacks-node/src/tests/signer/mod.rs	0.00%	20 Missing ⚠️
... and 6 more

❌ Your project check has failed because the head coverage (62.58%) 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 (3d27a91) and HEAD (17e0f3e). Click for more details.

HEAD has 36 uploads less than BASE

Flag	BASE (3d27a91)	HEAD (17e0f3e)
	73	37

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #6825       +/-   ##
============================================
- Coverage    78.33%   62.58%   -15.75%     
============================================
  Files          589      590        +1     
  Lines       357076   357941      +865     
============================================
- Hits        279700   224020    -55680     
- Misses       77376   133921    +56545     

Files with missing lines	Coverage Δ
stacks-node/src/tests/mod.rs	72.45% <ø> (-13.54%)	⬇️
stacks-node/src/tests/epoch_23.rs	0.00% <0.00%> (ø)
stacks-node/src/tests/stackerdb.rs	0.00% <0.00%> (ø)
stacks-node/src/tests/epoch_24.rs	0.00% <0.00%> (ø)
stacks-node/src/tests/epoch_22.rs	0.00% <0.00%> (ø)
stacks-node/src/tests/epoch_205.rs	0.00% <0.00%> (ø)
stacks-node/src/tests/signer/commands/context.rs	0.00% <0.00%> (-60.00%)	⬇️
stacks-node/src/tests/signer/mod.rs	0.00% <0.00%> (-69.19%)	⬇️
...tacks-node/src/tests/signer/commands/block_wait.rs	0.00% <0.00%> (-23.41%)	⬇️
stacks-node/src/tests/signer/v0/tx_replay.rs	0.00% <0.00%> (ø)
... and 7 more

... and 372 files with indirect coverage changes

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