feat(bqjdbc): Integrate the PerConnectionFileHandler with BigQueryJdbcRootLogger (#12933)

- **BigQueryConnection.java:**
- Integrated the MdcCloseable pattern with try-with-resources across all
methods requiring MDC context.[b/501081433]
- Extracted rollbackImpl() and closeImpl() to separate business logic
from logging setup.
   - Added connectionId generation in the constructor.[b/501081158] 
- **BigQueryStatement.java:**
- Refactored public JDBC execution methods to use MdcCloseable and
extracted Impl methods (like executeQueryImpl).[b/501081433]
- **BigQueryJdbcMdc.java:**
- Added the MdcCloseable interface to support the try-with-resources
pattern.
- Update the Log Record format to inject the Connection-ID
tag.[b/501081558]
- **BigQueryJdbcRootLogger.java:**
- Integrated PerConnectionFileHandler for log isolation.[b/501081671]

Author: Neenu1995

java-bigquery/google-cloud-bigquery-jdbc/.gitignore

@@ -1,3 +1,4 @@
 drivers/**
 target-it/**
-*logs*/**
+*logs*/**
+**/ITBigQueryJDBCLocalTest.java