Unify the minion plug-in package regex path

[Jackie-Jiang]

Description

Unify minion pluggable class (PinotTaskGenerator, PinotTaskExecutorFactory, MinionEventObserverFactory) package regex path to org.apache.pinot.*.plugin.minion.tasks.*.
Modify SimpleMinionClusterIntegrationTest to use the pluggable classes.

Release Notes

Regex path for pluggable MinionEventObserverFactory is changed from org.apache.pinot.*.event.* to org.apache.pinot.*.plugin.minion.tasks.*

[Jackie-Jiang]

@jackjlli Please review this PR. It fixes the regex path for MinionEventObserverFactory, which is missed in #6618

[codecov-commenter]

Codecov Report

Merging #6980 (2315ba7) into master (c76ce2a) will decrease coverage by 7.82%.
The diff coverage is 33.33%.

❗ Current head 2315ba7 differs from pull request most recent head 27ef483. Consider uploading reports for the commit 27ef483 to get more accurate results

@@             Coverage Diff              @@
##             master    #6980      +/-   ##
============================================
- Coverage     73.37%   65.55%   -7.83%     
  Complexity       12       12              
============================================
  Files          1441     1441              
  Lines         71430    71430              
  Branches      10351    10351              
============================================
- Hits          52415    46823    -5592     
- Misses        15490    21220    +5730     
+ Partials       3525     3387     -138     

Flag	Coverage Δ
integration	?
unittests	65.55% <33.33%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...x/core/minion/generator/TaskGeneratorRegistry.java	76.00% <ø> (-4.00%)	⬇️
...not/minion/event/EventObserverFactoryRegistry.java	0.00% <0.00%> (-56.53%)	⬇️
...t/minion/executor/TaskExecutorFactoryRegistry.java	12.00% <100.00%> (-76.00%)	⬇️
...a/org/apache/pinot/minion/metrics/MinionMeter.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/BrokerQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/minion/metrics/MinionQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
...pache/pinot/common/utils/grpc/GrpcQueryClient.java	0.00% <0.00%> (-100.00%)	⬇️
...pinot/minion/exception/TaskCancelledException.java	0.00% <0.00%> (-100.00%)	⬇️
...t/core/startree/plan/StarTreeDocIdSetPlanNode.java	0.00% <0.00%> (-100.00%)	⬇️
.../core/startree/plan/StarTreeTransformPlanNode.java	0.00% <0.00%> (-100.00%)	⬇️
... and 338 more

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[jackjlli]

LGTM. Thanks!