Extend Interop-2022 webcompat tests

[jgraham]

Proposal is to add https://wpt.fyi/results/css/CSS2/floats/floats-wrap-bfc-with-margin-001.html

That was one of the original bugs on the compat list, but didn't have any coverage at the time. Now it's been decided to align on Blink/WebKit behaviour and Gecko has added a test/fixed the issue, so the test shouldn't be a surprise to anyone, or adversely affect their score.

More details in #9 (comment)

[foolip]

Discussed in #77. Since the test already passes everywhere it's easy to say 👍 to including it. It's a valuable test that came out of this effort.

[nt1m]

web-platform-tests/wpt-metadata#2720

[foolip]

@nt1m looks like you used the interop-2022-compat label while the existing tests used interop-2022-webcompat. I'll fix this.

[nt1m]

oops, thanks for catching this!

[nt1m]

web-platform-tests/wpt-metadata#2729