chore: labels inconsistency

[crazy-max]

Some labels look inconsistent for "needs" https://github.com/docker/buildx/labels?q=needs

I think those starting with needs should be under status such as needs/attention should be status/needs-attention.

Also not sure what means or the purpose of needs/pull-request is?

[thompson-shaun]

Great callout. This should pair well with (or perhaps be closed by) https://github.com/docker/buildx/pull/2619

[crazy-max]

Updates status labels:

@thompson-shaun Looking at https://github.com/docker/buildx/blob/master/PROJECT.md#labels many of them are missing. I have just created the priority ones but not sure about the others if you can take a look.

I remove this issue from the milestone for the time being.