Pipe: Refactored the dataRegionId data type to integer

[Caideyipi]

Description

As the title said.

---

This PR has:

• been self-reviewed.
  • concurrent read
  • concurrent write
  • concurrent read and write
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods.
• added or updated version, license, or notice information
• added comments explaining the "why" and the intent of the code wherever would not be obvious
  for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold
  for code coverage.
• added integration tests.
• been tested in a test IoTDB cluster.

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Key changed/added classes (or packages if there are too many classes) in this PR

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.51%. Comparing base (7e0837b) to head (e835104).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...ipe/event/common/heartbeat/PipeHeartbeatEvent.java	0.00%	12 Missing ⚠️
...tdb/db/pipe/metric/source/PipeAssignerMetrics.java	18.18%	9 Missing ⚠️
...gion/realtime/assigner/PipeDataRegionAssigner.java	80.76%	5 Missing ⚠️
.../iotdb/db/storageengine/dataregion/DataRegion.java	66.66%	3 Missing ⚠️
...pe/consensus/deletion/DeletionResourceManager.java	71.42%	2 Missing ⚠️
.../event/common/tsfile/PipeTsFileInsertionEvent.java	0.00%	2 Missing ⚠️
...peHistoricalDataRegionTsFileAndDeletionSource.java	0.00%	2 Missing ⚠️
...mmon/tsfile/PipeCompactedTsFileInsertionEvent.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #17214   +/-   ##
=========================================
  Coverage     39.51%   39.51%           
  Complexity      282      282           
=========================================
  Files          5101     5101           
  Lines        341895   341916   +21     
  Branches      43525    43525           
=========================================
+ Hits         135085   135107   +22     
+ Misses       206810   206809    -1     

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