feat(icon): export qna and yammer icons

[lawrencecushman]

exports qna and yammer icons to the Teams theme

[codecov]

Codecov Report

Merging #1325 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1325      +/-   ##
==========================================
+ Coverage   72.29%   72.37%   +0.08%     
==========================================
  Files         762      760       -2     
  Lines        5767     5686      -81     
  Branches     1712     1687      -25     
==========================================
- Hits         4169     4115      -54     
+ Misses       1592     1565      -27     
  Partials        6        6

Impacted Files	Coverage Δ
...omponents/Icon/svg/ProcessedIcons/icons-yammer.tsx	100% <ø> (ø)	⬆️
...s/components/Icon/svg/ProcessedIcons/icons-qna.tsx	100% <ø> (ø)	⬆️
.../themes/teams/components/Icon/svg/icons/yammer.tsx	100% <100%> (ø)
...src/themes/teams/components/Icon/svg/icons/qna.tsx	100% <100%> (ø)
...ackages/react/src/components/Dropdown/Dropdown.tsx	87.75% <0%> (-0.77%)	⬇️
...ckages/react/src/components/Button/ButtonGroup.tsx	94.11% <0%> (ø)	⬆️
...kages/react/src/themes/teams-dark/siteVariables.ts	100% <0%> (ø)	⬆️
packages/react/src/components/Button/Button.tsx	90.9% <0%> (ø)	⬆️
...es/react/src/components/Reaction/ReactionGroup.tsx	100% <0%> (ø)	⬆️
...ckages/react/src/components/Portal/PortalInner.tsx	100% <0%> (ø)	⬆️
... and 65 more

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[codecov]

Codecov Report

Merging #1325 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1325      +/-   ##
==========================================
+ Coverage   72.36%   72.37%   +<.01%     
==========================================
  Files         758      760       +2     
  Lines        5684     5686       +2     
  Branches     1663     1687      +24     
==========================================
+ Hits         4113     4115       +2     
  Misses       1565     1565              
  Partials        6        6

Impacted Files	Coverage Δ
...omponents/Icon/svg/ProcessedIcons/icons-yammer.tsx	100% <ø> (ø)	⬆️
...s/components/Icon/svg/ProcessedIcons/icons-qna.tsx	100% <ø> (ø)	⬆️
.../themes/teams/components/Icon/svg/icons/yammer.tsx	100% <100%> (ø)
...src/themes/teams/components/Icon/svg/icons/qna.tsx	100% <100%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[miroslavstastny]

Please review and approve the screener changes before merging.

[lawrencecushman]

@miroslavstastny is this ready to go in? Can we merge today?