[Explore]multiple cosmetic issues in Explore popover (metrics, filters)

[junlincc]

1. Text area and buttons overlap
   Text area should have a smaller fixed height, scroll bar should stay within the text area

2. Save and Close button
   Save should be on the right, Close on the left

3. Resize icon
   shrink icon and enough spacing between icon and button

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[junlincc]

@kgabryje 🙏

[rusackas]

@junlin I think we're good here, but I'll let you verify on master :)

Also surprised GH doesn't automatically close issues when the PR says "Fixes #xyz"

[nytai]

@rusackas The fixes syntax works only when it's in the title, commit message, or description. You can also link the issue with the little widget on the right.

https://docs.github.com/en/free-pro-team@latest/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue

[rusackas]

I did it in the description not long ago and it didn't seem to work there. I've never tried the manual linking widget... will do next time for fun :D

[junlincc]

all looking good! we can finally move on from popover!! 😆