Hello @Anouar Bousarsar - Thanks for reaching out!
We apologize for any inconvenience caused by the confusing UI and guidance regarding the Dataverse connector. The issue (repetitive legacy flag under Action names) in the UI has been reported internally and the owning team is working on it. Regarding:
If our flows need an upgrade of the connector ? and how we can do this ?
The Logic Apps team recommends using the actions marked with "preview" for any new workloads -- the ones marked with "legacy" are on a deprecation path and will go away once the feature parity exists between them.
As for the below:
Limit date to migrate the connector ?
I've reached out to the owning team internally for any timeframe that they may be able to share. Once I hear back, I'll surely update my answer here with any findings. I hope this answer helps & brings some clarity for now but pls don't hesitate to reach out in the comments below if you have any further questions.