chore: cover HIP-869 test plan

[tinker-michaelj]

Description:

• Closes Ensure DabFreezeTest has desired net-new coverage #15560 by extending DabEnabledUpgradeTest to include a "multipart" DAB edit that both deletes and updates new and existing nodes before and after PREPARE_UPGRADE; and validates that only the edits before the PREPARE_UPGRADE take effect.
• Fixes a copy+paste error that could make DabEnabledUpgradeTest flake by creating a directory(!) at a config.txt path. 😳
• For maximum safety, always resets the BlockStreamService singleton's migrated state hash before initializing schemas.
• Adds a bit more detail to the BlockStreamManagerImpl initialization log.
• ⚠️ Fixes an unreliable object referential equality check with Bytes.EMPTY in ConcurrentStreamingTreeHasher.
• Adds RoundHeader block items.

[codecov]

Codecov Report

Attention: Patch coverage is 35.29412% with 11 lines in your changes missing coverage. Please review.

Project coverage is 58.21%. Comparing base (aa75ff7) to head (5f273b0).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...-app/src/main/java/com/hedera/node/app/Hedera.java	0.00%	4 Missing ⚠️
...com/hedera/node/app/blocks/BlockStreamService.java	25.00%	3 Missing ⚠️
...dera/node/app/workflows/handle/HandleWorkflow.java	0.00%	3 Missing ⚠️
...a/node/app/blocks/impl/BlockStreamManagerImpl.java	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #15568   +/-   ##
==========================================
  Coverage      58.20%   58.21%           
- Complexity     21604    21617   +13     
==========================================
  Files           2785     2785           
  Lines         109481   109542   +61     
  Branches       11200    11211   +11     
==========================================
+ Hits           63721    63767   +46     
- Misses         41887    41898   +11     
- Partials        3873     3877    +4     

Files with missing lines	Coverage Δ
...app/blocks/impl/ConcurrentStreamingTreeHasher.java	95.09% <100.00%> (ø)
...a/node/app/blocks/impl/BlockStreamManagerImpl.java	97.52% <80.00%> (-0.47%)	⬇️
...com/hedera/node/app/blocks/BlockStreamService.java	68.75% <25.00%> (-14.59%)	⬇️
...dera/node/app/workflows/handle/HandleWorkflow.java	27.58% <0.00%> (-0.42%)	⬇️
...-app/src/main/java/com/hedera/node/app/Hedera.java	11.67% <0.00%> (-0.08%)	⬇️

... and 17 files with indirect coverage changes

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 41.18%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (aa75ff7)	109298	67484	61.74%
Head commit (5f273b0)	109359 (+61)	67534 (+50)	61.75% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#15568)	17	7	41.18%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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