Remove built-in jexl function in tree mode

[JackieTien97]

This pull request removes support for the JEXL user-defined table function (UDF) from the codebase. The removal includes code, configuration, and tests related to the JEXL function, as well as its dependency.

Key changes:

Removal of JEXL UDF support:

• Deleted the JEXL entry from the BuiltinTimeSeriesGeneratingFunction enum, so it is no longer recognized as a built-in function (iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/udf/BuiltinTimeSeriesGeneratingFunction.java).
• Removed the import of the UDTFJexl class from the same file, cleaning up unused imports (iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/udf/BuiltinTimeSeriesGeneratingFunction.java).
• Deleted the JEXL entry from the BuiltinTimeSeriesGeneratingFunctionEnum enum, fully removing its enumeration from the test constants (integration-test/src/main/java/org/apache/iotdb/itbase/constant/BuiltinTimeSeriesGeneratingFunctionEnum.java).

Test and dependency cleanup:

• Removed the testUDTFJexl test case, which exercised the JEXL UDF, from the integration tests (integration-test/src/test/java/org/apache/iotdb/db/it/udf/IoTDBUDTFBuiltinFunctionIT.java).
• Removed the commons-jexl3 dependency from both the Maven pom.xml and the dependencies.json file, since it is no longer needed (iotdb-core/node-commons/pom.xml, dependencies.json) [1] [2].

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.18%. Comparing base (0b25ea2) to head (f72edaf).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #17092    +/-   ##
==========================================
  Coverage     39.18%   39.18%            
  Complexity      282      282            
==========================================
  Files          5129     5128     -1     
  Lines        343253   343113   -140     
  Branches      43768    43758    -10     
==========================================
- Hits         134493   134465    -28     
+ Misses       208760   208648   -112     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.