Proposed changes

Currently expect-webdriverio is implicitly loading expect global type, which is "wrong" since the runtime of expect-webdriverio does not actually load expect into the runtime global scope.
webdriverio/expect-webdriverio#1496 fixes this issue but then we need to make sure to load this type in @wdio/globals.

Types of changes

• Polish (an improvement for an existing feature)
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (improvements to the project's docs)
• Specification changes (updates to WebDriver command specifications)
• Internal updates (everything related to internal scripts, governance documentation and CI files)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Backport Request

//: # (The current main branch is the development branch for WebdriverIO v9. If your change should be released to the current major version of WebdriverIO (v8), please raise another PR with the same changes against the v8 branch.)

• This change is solely for v9 and doesn't need to be back-ported
• Back-ported PR at [backport] @wdio/globals: Declare "expect" global type explicitly #12502

Reviewers: @webdriverio/project-committers