build: move Windows release builds to AppVeyor cloud

[jkleinsc]

Description of Change

This PR moves our Windows builds from our self hosted AppVeyor instance to AppVeyor's cloud hosted instance.

Checklist

• PR description included and stakeholders cc'd
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: no-notes

[zcbenz]

3-1-x needs manual backport.

[zcbenz]

This needs approval from @electron/wg-releases .

[MarshallOfSound]

• We should only make this change to master and then backport once we've successfully triggered and run a nightly release from the master branch. I.e. Let's remove the backport labels for now
• I don't want to merge this until sudowoodo can handle both windows-ci.electronjs.org and ci.appveyor.com

The sudowoodo files that need updating are:

• https://github.com/electron/sudowoodo/blob/master/src/operations/build.ts
• https://github.com/electron/sudowoodo/blob/master/src/utils/cancel-builds.ts

Let me know if you want help updating sudowoodo

[jkleinsc]

@MarshallOfSound corresponding sudowoodo PR here: electron/sudowoodo#120.

I added a new env variable, APPVEYOR_CLOUD_TOKEN so that sudowoodo can run builds on both self hosted AppVeyor and cloud hosted AppVeyor.

[release-clerk]

No Release Notes

[jkleinsc]

/trop run backport-to 6-0-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "6-0-x" here we go! :D

[jkleinsc]

/trop run backport-to 5-0-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "5-0-x" here we go! :D

[trop]

I have automatically backported this PR to "6-0-x", please check out #18603

[jkleinsc]

/trop run backport-to 4-2-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "4-2-x" here we go! :D

[trop]

I have automatically backported this PR to "5-0-x", please check out #18604

[jkleinsc]

/trop run backport-to 3-1-x

[trop]

The backport process for this PR has been manually initiated,
sending your 1's and 0's to "3-1-x" here we go! :D

[trop]

I have automatically backported this PR to "4-2-x", please check out #18605

[trop]

I was unable to backport this PR to "3-1-x" cleanly;
you will need to perform this backport manually.

[trop]

A maintainer has manually backported this PR to "3-1-x", please check out #18627