Add timeout overflow break handling at leaf stage

[xiangfu0]

Summary

• introduce timeoutOverflowMode plumbing in server/broker metadata
• make LeafOperator break early only if mode=BREAK and expose a TIMEOUT_OVERFLOW_REACHED stat so intermediates keep running
• add SlowMockInstanceDataManagerFactory plus TimeoutOverflowQueryRunnerTest to cover simple select, join, and aggregation cases

query with partial results

query with full results

[codecov-commenter]

Codecov Report

❌ Patch coverage is 65.95745% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.11%. Comparing base (2892236) to head (f89cfe7).

Files with missing lines	Patch %	Lines
...pinot/query/runtime/operator/BaseJoinOperator.java	28.57%	16 Missing and 4 partials ⚠️
...che/pinot/query/runtime/operator/LeafOperator.java	71.42%	7 Missing and 5 partials ⚠️
...va/org/apache/pinot/query/runtime/QueryRunner.java	80.43%	4 Missing and 5 partials ⚠️
...common/response/broker/BrokerResponseNativeV2.java	70.00%	1 Missing and 2 partials ⚠️
...not/query/runtime/operator/MultiStageOperator.java	71.42%	1 Missing and 1 partial ⚠️
...va/org/apache/pinot/spi/utils/CommonConstants.java	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (2892236) and HEAD (f89cfe7). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (2892236)	HEAD (f89cfe7)
unittests	2	1
java-25	5	1
temurin	5	1
integration	3	0
integration2	1	0
integration1	1	0
custom-integration1	1	0
unittests2	1	0

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17216      +/-   ##
============================================
- Coverage     65.39%   57.11%   -8.28%     
+ Complexity     1405        1    -1404     
============================================
  Files          3423     2626     -797     
  Lines        215968   156436   -59532     
  Branches      34186    25557    -8629     
============================================
- Hits         141228    89351   -51877     
+ Misses        63380    59449    -3931     
+ Partials      11360     7636    -3724     

Flag	Coverage Δ
custom-integration1	?
integration	?
integration1	?
integration2	?
java-25	57.11% <65.95%> (-8.28%)	⬇️
temurin	57.11% <65.95%> (-8.28%)	⬇️
unittests	57.11% <65.95%> (-8.28%)	⬇️
unittests1	57.11% <65.95%> (-0.01%)	⬇️
unittests2	?

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