[EuiPopover] has no way to pass data-test-subj to panel

[myasonik]

Might be nice to reorganize all the panel props as a panelProps object which could then be spread into the panel so that anything could be passed in.

Otherwise, following the current convention, we should add panelDataTestSubj I guess?

First mentioned in elastic/kibana#83422 (comment)

[akashgp09]

woking on it

[myasonik]

@cchaos Do you have a feeling on which approach is best to take here?

Do we just add a panelDataTestSubj following the current convention on EuiPopover? Or would it be better to ship a breaking change and pass along a single panelProps object that seems more inline with other components?

I guess to avoid a breaking change, we could also support both things but that might get messy?

[cchaos]

We may just want to support both for now. Meaning, keep the existing panel specific props as they exist, but then extend with panelProps to encompass all possible props. This way we don't make unnecessary breaking changes since Popovers are everywhere.