Pipe: dynamically share idle floating memory with TsFile sync

[Caideyipi]

Summary

• Treat pipe_total_floating_memory_proportion as the maximum InsertNode floating-memory proportion instead of a statically reserved partition.
• Let TsFile and other non-floating Pipe allocations borrow unused floating memory while retaining a symmetric cap when InsertNode usage grows.
• Add regression coverage for sharing and reclaiming the same memory pool.

Tests

• PipeMemoryManagerResizeTest (3 tests)
• PipeMemoryManagerTest (8 tests)
• PipeDataNodeTaskAgentTest
• Spotless checks for datanode and node-commons

Full reactor compilation was attempted but could not complete because the host ran out of JVM/pagefile memory while compiling the existing DataNode reactor.

[sonarqubecloud]

Quality Gate passed

Issues
20 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
2.6% Duplication on New Code

See analysis details on SonarQube Cloud