check 13.1 test faulres

13.1 https://server-test.mariadb.net/?product_ids=2&product_ids=8&show_skipped_results=false&only_last_commits=false&time_interval=-1&test_name=&commit_id=&columnstore_commit_id=&target_name=13.1_stable-23.10-08-18-2026--13-55-40&run_id=&runs_with_additional_tools=false&currentTestResultId=407808822

There are several tests that failed due to different default charset and collation

to be investigated:
https://server-test.mariadb.net/?product_ids=2&product_ids=8&show_skipped_results=false&only_last_commits=false&time_interval=-1&test_name=&commit_id=&columnstore_commit_id=&target_name=13.1_stable-23.10-08-18-2026--13-55-40&run_id=&runs_with_additional_tools=false&currentTestResultId=407809128&currentTestCaseId=14357&currentTargetBuildId=15916

it seems some other test does not do a proper cleanup: https://server-test.mariadb.net/?product_ids=2&product_ids=8&show_skipped_results=false&only_last_commits=false&time_interval=-1&test_name=&commit_id=&columnstore_commit_id=&target_name=13.1_stable-23.10-08-18-2026--13-55-40&run_id=&runs_with_additional_tools=false&currentTestResultId=407809127&currentTestCaseId=14343&currentTargetBuildId=15916

a new limitation in the server on lenght of vars https://server-test.mariadb.net/?product_ids=2&product_ids=8&show_skipped_results=false&only_last_commits=false&time_interval=-1&test_name=&commit_id=&columnstore_commit_id=&target_name=13.1_stable-23.10-08-18-2026--13-55-40&run_id=&runs_with_additional_tools=false&currentTestResultId=407809126&currentTestCaseId=14330&currentTargetBuildId=15916