x/build/cloudfns/{sendwikidiff,wikiwebhook}: merge nested modules into root module

[dmitshur]

Our cloud function code currently lives in individual nested modules:

• golang.org/x/build/cloudfns/sendwikidiff
• golang.org/x/build/cloudfns/wikiwebhook

It was originally done out of necessity of deployment: "Your function must be in a Go package at the root of your project." per docs, and we didn't want to put them in golang.org/x/build itself.

This is fine, but it does cause some overhead because we pay the costs of maintaining module versions in each module individually without much of an upside. It also means running their tests requires either cding into their directory or using a go workspace, instead of just go test ./... at the repo root. There's no particular good reason for them to stay as separate modules.

This is the tracking issue to move them into the root x/build module and deal with Cloud Function deployment specifics during the deployment step.

CC @golang/release.

[gopherbot]

Change https://go.dev/cl/486955 mentions this issue: cloudfns: merge nested modules into root module, update Go runtime

[gopherbot]

Change https://go.dev/cl/486956 mentions this issue: cloudfns: use go.dev instead of golang.org