Add discussion state Octicons

[gavinmn]

Closes https://github.com/github/primer/issues/1895

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Latest commit: 5e59af33c72a7c3da079669d6b05554cd5425c99

The changes in this PR will be included in the next version bump.

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| Name | Type | | ---------------- | ----- | | @primer/octicons | Minor |

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[gavinmn]

Hearing some feedback that when looking at the icons in context (example), I think I agree with — the state details are really small. I tried more variations to make this work and think this set may be better.

[antn]

I think those look great, @gavinmn! Let's go with those.

[gavinmn]

I think those look great, @gavinmn! Let's go with those.

Working on one more "reopen" state to add and then I'll get these out the door.

[gavinmn]

Here's a new full proposal for the state icons, increasing the state accessory size by incorporating them into the icon and adding a discussion-reopen icon.

[gavinmn]

Shipping We're discarding the reopen variant in favor of using no icon, or the discussion-open icon.