provide warning before clicking in dropdown and disable preset/function

[kecnry]

This PR is a PR to this PR: spacetelescope#2671

This PR moves the warning stating that choosing "Random" as a colormap overrides the values for stretch function and percentile preset from after making the selection to before via a tooltip in the dropdown itself. This also then disables the inputs for stretch function and percentile preset.

Screen.Recording.2024-01-24.at.3.17.39.PM.mov

Note that this does not technically prevent the user from overriding these values from the API, nor does it result in this warning being raised in advance when setting the colormap to "Random" from the API.

I did not rename "Random" here, but do think that naming it something tied specifically to segmentation maps, and adding that context in the warning itself, would also be useful additions.

[codecov-commenter]

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[kecnry]

closing in favor of a dialog to apply changes implemented in the original PR