Fixed maps tooltip display at dark mode

[junqiu-lei]

Description

Followed from #458 (comment), this PR:

1. Removes the redundant padding on tooltip
2. Changes the scroll bar to automatically display on tooltip

Test

Before:

After:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[kgcreative]

I still see a white triangle at the bottom of the tooltip in darkmode. (just a minor nitpick)

[junqiu-lei]

I still see a white triangle at the bottom of the tooltip in darkmode. (just a minor nitpick)

@kgcreative Thanks, updated this part

[kgcreative]

I still see a white triangle at the bottom of the tooltip in darkmode. (just a minor nitpick)

@kgcreative Thanks, updated this part

LGTM!

[canascar]

I still see a white triangle at the bottom of the tooltip in darkmode. (just a minor nitpick)

@kgcreative Thanks, updated this part

LGTM!

We may have to see how this popover is implemented. Is it hard coded or using the popover component? Works for now but the border does not appear to be merged with and applied to the popover arrow indicator:

1. Appears as if the dropshadow is within the contents of the popover (panel?) and not the tooltip - which is missing the dropshadow here.
2. The border does not seem to be applied to the popover but rather the contents inside (panel?)

VS

Reference:
https://oui.opensearch.org/1.3/#/layout/popover
Popover should have a border and dropshadow applied. Contents within should not contain surrounding (container) borders or shadows.

--- Also, this issue is not just in Dark mode as stated in here:
#563

[junqiu-lei]

@canascar The popover component is come from maplibre instead of OUI which is implemented by @VijayanB, I don't think it can be easily replaced to the OUI component? CC @VijayanB

[kgcreative]

Yeah, my understanding is we're "sort of" making it look like OUI, but there will be differences.