Bump Prettier from 2.8.8 to 3.0.0

[queengooborg]

This PR bumps Prettier from 2.8.8 to 3.0.0, and then fixes issues with the content commands caused by changes to the Prettier API. In Prettier v3.0, the format() command became asynchronous, so we were returning a Promise every so often, which caused errors when running commands. This PR aims to fix this by adding an await, and making the rest of the function chain asynchronous.

Note: because the content repositories use Prettier 3.0.0, these commands are broken regardless of the Prettier version Yari is requesting.

Note: because Prettier has changed its defaults, the formatting output has also changed. TO pass linting, all files had to be formatted, which unfortunately means a greater risk of merge conflicts. Since this is a critical bug fix, it should be merged quickly anyways.

[queengooborg]

I'm marking this as a draft because the CI test is failing and I don't have the availability to dig into it further. CC @caugner @fiji-flo @LeoMcA (note: this is somewhat urgent as it is disrupting contributor workflow)

[queengooborg]

Oh...well, apparently, the last commit I pushed fixed it all up, so never mind my last comment. 😛

[github-actions]

This pull request has merge conflicts that must be resolved before it can be merged.

[queengooborg]

@LeoMcA, I see that you're around -- are you available and willing to review and merge this quickly by chance? (Highly recommend reviewing by commit since Prettier formatting also has to be run in the same go...)

[LeoMcA]

@queengooborg taking a look, but first up: I reckon now's not the time to make the trailingComma change if we want to merge this quickly (and if we do that in a separate PR, we can add that squashed commit to a blame ignore revs file).

Could you configure { "trailingComma": "es5" } and force push with a new "run prettier" commit (or none if there's no other changes between 2.8.8 and 3)?

[queengooborg]

That's a fair point, since most of the formatting changes are from adding trailing commas. There are still some other changes, so I've included that commit.

[LeoMcA]

Looks good, just the one change: