[mellanox] [db_migrator] add a migration for tunnel ecn mode #4132
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What I did
In the 202511, the tunnel ECN mode for Mellanox platforms has changed from standard to copy_from_outer.
This commit adds a migration that aligns APPL_DB to this change.
How I did it
Added a new migration for the Mellanox platform.
How to verify it
New unit test, manual tests.
Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)