Proposed changes

Previously we assumed that anyone with browserstack service installed wants to run their tests on browserstack only, now we want to allow people run tests locally along with browserstack service for observability. Made necessary changes for that. This PR includes changes for V7.

• Added test observability user check before setting creds.
• Added browserstack session check before adding service version

Related V8 PR: #10037

Types of changes

• 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

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 necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

Reviewers: @webdriverio/project-committers