fix(Popup): close previous popup on enter key

[jongsue]

fixes #866

I found the line that makes this bug

I tried to make the test case for this, but still failed it
even though it seems working fine

Popup's updateOutsideClickSubscription method has setTimeout
the test case runs before setTimeout callback

I hope someone can help me to make the test case pass

[layershifter]

Actually, we should use EventStack now to handle this, but it's not fully correct. I have a prototype that solves this issue (https://codesandbox.io/s/9yw3vq6774) and will be implemented in #949.

For now going to push changes to get it working.

[codecov]

Codecov Report

Merging #985 into master will increase coverage by 0.11%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #985      +/-   ##
==========================================
+ Coverage   81.15%   81.26%   +0.11%     
==========================================
  Files         673      671       -2     
  Lines        8654     8633      -21     
  Branches     1528     1524       -4     
==========================================
- Hits         7023     7016       -7     
+ Misses       1616     1602      -14     
  Partials       15       15

Impacted Files	Coverage Δ
packages/react/src/components/Popup/Popup.tsx	74.5% <83.33%> (+1.82%)	⬆️
...ct/src/components/Dropdown/DropdownSearchInput.tsx	48.14% <0%> (-1.86%)	⬇️
...ages/react/test/specs/commonTests/isConformant.tsx	93.36% <0%> (-0.19%)	⬇️
...ackages/react/src/components/Dropdown/Dropdown.tsx	39.68% <0%> (ø)	⬆️
.../src/themes/teams/components/Icon/iconVariables.ts	100% <0%> (ø)	⬆️
packages/react/src/components/Icon/Icon.tsx	83.33% <0%> (ø)	⬆️
packages/react/src/components/Ref/RefFindNode.tsx	100% <0%> (ø)	⬆️
packages/react/test/utils/index.ts	100% <0%> (ø)	⬆️
...sibility/Behaviors/Popup/popupFocusTrapBehavior.ts	100% <0%> (ø)	⬆️
... and 4 more

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[bmdalex]

thanks for fixing 👍 one comment
fyi @kuzhelov

[jongsue]

I did extra method to reuse it as @Bugaa92 said

Thank you guys for the reviews
I've learned a lot of good points here

[kuzhelov]

please, just update Fixes section of changelog before merge 👍