[Caideyipi]

Backports #19064 (59ac348a3f2954cbdbc5e53c01a3cd475a187880) onto dev/1.3 at 01a889cd5fd50bfe7d4eb3e6b24091c9ea634739.

Scope Pipe leader caches by the configured receiver endpoint set and device, and resolve tablet batch routing through the corresponding client manager. This prevents one sink from using another receiving cluster's cached leader.

The backport preserves the 1.3 client constructors and memory API, reproduces equivalent endpoint formatting locally, and adapts the test fixture and older Tablet API (schema type and explicit row count). Regression scenarios and assertions are preserved.

Validation:

• Spotless passed for the affected modules.
• Required IoTDB modules and dependencies compiled from source; the matching TsFile dependency was rebuilt from source.
• 7 focused unit tests and both IoTDBPipeForwardIT methods passed under MultiClusterIT3, with no skipped tests. The new IT passed after the Tablet compatibility adaptation; the already-passing method was not repeated.
• The new borrowing regression reproduced cross-receiver misrouting against the original target-base production classes.

[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