(internal): fix usage of intialise wording in variables, comments and elsewhere

[christian-bromann]

Proposed changes

We have been using initialise across the code base. initialise and initialize are both English terms. Initialize is predominantly used in 🇺🇸 American (US) English ( en-US ) while initialise is predominantly used in 🇬🇧 British English (used in UK/AU/NZ) ( en-GB ). In the United States, there is a preference for "initialize" over "initialise" (99 to 1).

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

n/a

Reviewers: @webdriverio/project-committers