Segments UI: warn users when using the IN operator

[khvn26]

Is your feature request related to a problem? Please describe.

In local evaluation mode, older SDKs will break if they receive an environment containing segments with the IN operator. This is clarified here: https://docs.flagsmith.com/clients/overview#in-segment-operator

During segment creation/editing, we should warn the users about this.

Describe the solution you'd like

Whenever the user chooses the IN segment operator, display a warning with the above link. The copy should read:

Check your SDK version supports the IN operator.

Describe alternatives you've considered

N/A