[CI][E2E] Stabilize SQL Server XA setup for schema evolution

[DanielLeens]

What's changed

• switch the SQL Server container setup to the supported MSSQL_SA_PASSWORD variable and configure the MSDTC RPC/DTC ports required by containerized XA transactions
• wait for a real sqlcmd login before running XA setup so the test does not race SQL Server upgrade work
• fail fast when sp_configure or sp_sqljdbc_xa_install fails, and wait until xp_sqljdbc_xa_init_ex becomes visible before the exactly-once path starts
• remove the invalid external user enabled setup step and relax the ready-log matcher so startup does not depend on a trailing newline

Validation

• ./mvnw -nsu -pl seatunnel-e2e/seatunnel-connector-v2-e2e/connector-jdbc-e2e/connector-jdbc-e2e-ddl spotless:apply
• ./mvnw -nsu -pl seatunnel-e2e/seatunnel-connector-v2-e2e/connector-jdbc-e2e/connector-jdbc-e2e-ddl -q -DskipTests verify
• ./mvnw -nsu -pl seatunnel-e2e/seatunnel-connector-v2-e2e/connector-jdbc-e2e/connector-jdbc-e2e-ddl -DfailIfNoTests=false -Dtest=SqlServerSchemaChangeIT test
  • on /Volumes/disk2/work/myworkspace/tmp/seatunnel-dev-sqlserver-xa-init-20260620, the host filesystem exposed src/test/resources/docker/setup.sql to the MySQL container with unreadable permissions and the run stopped before the SQL Server path (Permission denied)
  • on /Users/stone/work/myworkspace/seatunnel_third with normal file permissions, MySQL initialization succeeded and SQL Server 2022 still failed under the local Docker Desktop memory cap before reaching the ready log (Available Physical Memory 89.32 mb, Error 701, Failed allocate pages)
• seatunnel-engine-ui was skipped because this change does not touch that module
• no modules or deployment artifacts were reused in this run

References

• https://learn.microsoft.com/en-us/sql/linux/containers/configure-distributed-transactions?view=sql-server-ver17
• https://learn.microsoft.com/en-us/sql/connect/jdbc/understanding-xa-transactions?view=sql-server-ver17
• https://learn.microsoft.com/el-gr/sql/linux/configure/environment-variables?view=sql-server-linux-ver17