fix!(runner): correctly process custom tasks, update runner hooks naming

[sheremet-va]

Description

This is a breaking change. Previous support for custom tasks has been rewritten a little bit.

Fixes #3404

1. Methods on custom runner that referenced "test" now mention "task" (onAfterRunTest is now onAfterRunTask and so on, onBeforeRun and onAfterRun are now named onBeforeRunFiles and onAfterRunFiles). They now also accept tasks with type "custom" (the shape of the object is identical)
2. To collect custom tasks you now need to call getCurrentSuite().task() instead of getCurrentSuite().custom(). It now accepts a second arguments which are options. You can pass down handler as handler instead of saving it using setFn. If you used createChainable before, you can spread this in options instead of calling custom.call(this) - this now has no effect, it no longer relies on this at all:

  getCurrentSuite().task(name, {
    ...this, // so "todo"/"skip" is tracked correctly
    meta: {
      customPropertyToDifferentiateTask: true
    },
    handler: fn,
    timeout,
  })

3. Vitest also now provides a createTaskCollector utility - this will define a function that supports todo/skip/each/skipIf/runIf and other .test chainables. The difference with createChainable is that you don't need to specify what you need to support, and it also supports more methods (each/runIf/skipIf):

const myCustomTask = createTaskCollector(function (name, fn, timeout) {
   getCurrentSuite().task(name, {
     ...this, // so "todo"/"skip" is tracked correctly
     meta: {
       customPropertyToDifferentiateTask: true
     },
     handler: fn,
     timeout,
   })
 })

myCustomTask.each([1, 2])('name', (data: number) => {
  // ... do whatever you want
})

myCustomTask.skipIf(isWindows)('name', () => {
   // ...
})

3. SnapshotClient now accepts options - instead of overriding equalityCheck you need to pass down isEqual function. If you don't rely on .toMatchSnapshot({ ... }) tests (checking an object shape AND a snapshot string), you don't need to pass anything.
4. Some of the methods on SnapshotClient were renamed to better represent what they do: setTest -> startCurrentRun, resetCurrent -> finishCurrentRun (you need to call .assert between those two calls)
5. This PR also removes context.meta. It was deprecated for some time, please use context.task instead.

And now it actually works :)

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• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
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Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

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