chore: Ensure inbound statusz request returns empty if known publishers is empty.

[jsync-swirlds]

Reviewer Notes

• Adjusted inbound status handler to return empty NetworkData if known publishers is empty.
• Removed one high-frequency, and unnecessary, trace log.

Related Issue(s)

Resolves #3540

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...tream/subscriber/BlockStreamSubscriberSession.java	0.00%	1 Missing ⚠️

@@             Coverage Diff              @@
##               main    #3572      +/-   ##
============================================
- Coverage     83.66%   83.65%   -0.02%     
+ Complexity     2596     2594       -2     
============================================
  Files           219      219              
  Lines         11377    11379       +2     
  Branches       1331     1332       +1     
============================================
  Hits           9519     9519              
- Misses         1365     1368       +3     
+ Partials        493      492       -1     

Files with missing lines	Coverage Δ	Complexity Δ
.../hiero/block/node/health/InboundStatusHandler.java	100.00% <100.00%> (ø)	3.00 <0.00> (+1.00)
...tream/subscriber/BlockStreamSubscriberSession.java	71.91% <0.00%> (-0.09%)	80.00 <0.00> (-3.00)

... and 1 file with indirect coverage changes

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