fix: Fix BlockAccessService - getBlock - when using only retrieve_latest=true

[AlfredoG87]

Reviewer Notes

current request does not work:

grpcurl -plaintext -import-path  <insertDir> -proto block_access_service.proto -d '{"retrieve_latest":"true"}' 127.0.0.1:8080 org.hiero.block.api.BlockAccessService.getBlock

with this temporary fix, we make it work.

but it could also work when:

grpcurl -plaintext -import-path  <insertDir> -proto block_access_service.proto -d '{"block_number": "18446744073709551615", "retrieve_latest":"true"}' 127.0.0.1:8080 org.hiero.block.api.BlockAccessService.getBlock

[Nana-EC]

Looking good but one suggestion to include more coverage

[Nana-EC]

LG to unblock.
The test case for -1 should probably be restored later but with a different error condition

[Nana-EC]

LG

[Nana-EC]

LG

[jsync-swirlds]

This PR should not apply to main, as it creates a bug to work around a bad assumption.
Can we target this only to the release branch as a temporary patch/workaround, and rely on the bug issue to actually fix this correctly in main?

[Nana-EC]

Appropriate as work around for v0.10.0 testing

[AlfredoG87]

superseeded by #1147

and founded another workaround so no need to rush this change into current release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@                Coverage Diff                 @@
##             release/0.10    #1146      +/-   ##
==================================================
- Coverage           84.86%   84.84%   -0.02%     
+ Complexity            916      914       -2     
==================================================
  Files                 104      104              
  Lines                3719     3715       -4     
  Branches              396      395       -1     
==================================================
- Hits                 3156     3152       -4     
  Misses                411      411              
  Partials              152      152              

Files with missing lines	Coverage Δ	Complexity Δ
.../node/access/service/BlockAccessServicePlugin.java	80.64% <100.00%> (-1.18%)	9.00 <0.00> (-2.00)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.