x/build: set of first class ports is out of sync with porting policy

[findleyr]

I'm trying to clean up the x/tools build dashboard, starting with first class ports. Per the porting policy broken builds in first class ports should block releases. However, the set of first class ports listed in our build dashboard is out of sync with the ports listed in that policy.

Which is authoritative? Can we get them in sync?

CC @golang/release

[dmitshur]

Which is authoritative?

The list in https://golang.org/wiki/PortingPolicy#first-class-ports is authoritative.

Can we get them in sync?

Yes, we should. There's work in progress but it's was blocked on even more work in #34744, which put on hold during the 1.16 freeze. Issue #27689 tracks this task, so I'll close this issue as a duplicate.

[findleyr]

Ah, I missed that issue. Thanks Dmitri.