Limit Tag Creation To Staff

Both of these dropdowns should have a “Staff” option:

As discussed here:

Thank you!

cc @neil

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Sounds good to me @neil, whenever you want to get to it.

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Should we include staff and admin groups in trust levels?

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Probably staff vs not-staff is fine for now, we can make it more granular later if people ask for that.

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I added a new enum type TrustLevelAndStaffSetting.

https://github.com/discourse/discourse/pull/6023

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