MDEV-38389: Galera test failure on galera_3nodes.galera_vote_majority_dml

[plampio]

Fix the broken Galera MTR test galera_3nodes.galera_vote_majority_dml
by restoring the value of the AUTO_INCREMENT_OFFSET at the end of the
test.

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[gemini-code-assist]

Code Review

This pull request updates the galera_vote_majority_dml test case in the galera_3nodes suite to save and restore the original auto_increment_offset values for the three nodes. It also adjusts the connection sequence and node setup in both the test and result files. I have no feedback to provide.

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