feat: Added pipeline operation timeout detection

[AlexKehayov]

Description:

• Added pipelineOperationTimeout config parameter (default: 3s) to detect unresponsive block nodes during gRPC pipeline operations
• Implemented timeout detection for onNext() operations when sending block items - triggers stream failure and retry on timeout
• Implemented timeout detection for onComplete() operations when closing the stream - logs timeout but allows graceful close
• Timeout tasks are cancelled if operations complete successfully
• Added conn_pipelineOperationTimeout counter to track timeouts across both operations
• Updated Grafana dashboard with panels for the new timeout metric
• Updated unit tests to verify timeout behavior
• Updated documentation with timeout details

Closes #21605

[lfdt-bot]

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[codecov]

Codecov Report

❌ Patch coverage is 91.54930% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...app/blocks/impl/streaming/BlockNodeConnection.java	93.84%	2 Missing and 2 partials ⚠️
...om/hedera/node/app/metrics/BlockStreamMetrics.java	60.00%	2 Missing ⚠️

@@             Coverage Diff              @@
##               main   #21663      +/-   ##
============================================
+ Coverage     70.62%   70.66%   +0.03%     
- Complexity    24353    24367      +14     
============================================
  Files          2673     2673              
  Lines        104202   104262      +60     
  Branches      10935    10937       +2     
============================================
+ Hits          73591    73672      +81     
+ Misses        26567    26547      -20     
+ Partials       4044     4043       -1     

Files with missing lines	Coverage Δ	Complexity Δ
...cks/impl/streaming/BlockNodeConnectionManager.java	91.86% <100.00%> (+0.01%)	74.00 <0.00> (ø)
...ra/node/config/data/BlockNodeConnectionConfig.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...om/hedera/node/app/metrics/BlockStreamMetrics.java	72.24% <60.00%> (+0.62%)	29.00 <0.00> (+1.00)
...app/blocks/impl/streaming/BlockNodeConnection.java	90.72% <93.84%> (+<0.01%)	78.00 <2.00> (+2.00)

... and 12 files with indirect coverage changes

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[petreze]

A mirror PR is created for this work

[derektriley]

We should also have timeouts around creating the PbjGrpcClient and pipeline

 blockStreamPublishServiceClient = createNewGrpcClient();
            final Pipeline<? super PublishStreamRequest> pipeline =
                    blockStreamPublishServiceClient.publishBlockStream(this);

[derektriley]

Can we please get the rolling log file renamed from blocknode-comms.log to block-node-comms.log

[petreze]

Checks are passing on the mirror PR

[lukelee-sl]

LGTM. Seems unrelated to SC