feat: single cancellable scan

[dominikg]

Description

scanning currently starts multiple esbuild promises and there is no way to cancel them.

use a single pass promise and add a plugin that cancels the running build when calling cancel()

Additional context

this may be useful to prevent parallel runs of the optimizer too, ideally there was a simpler way to cancel the esbuild promise but i didn't see it :/

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[dominikg]

see #11245 for this without cancel.

[benmccann]

I filed a feature request: evanw/esbuild#2725

[benmccann]

@dominikg perhaps you'd be able to rebase this PR?

esbuild added support for cancel in 0.17.1: https://github.com/evanw/esbuild/releases/tag/v0.17.1

vite now uses esbuild@0.17.5

[IanVS]

I wonder if this might help solve #9986. That sure would be nice! It's a big frustration for a lot of Storybook-vite users.

[dominikg]

not sure if rebase is a good idea, this PR has extra complexity that's no longer needed with the new esbuild api.