Fix logging webdriver request

[martingrossmann]

Description

All capabilities of a new WebDriver request are logged to console and report. To prevent overlong strings some values like browser extensions are shortend.
Due to a bug these changes of capabilities became persistent and chrome extensions could not be used.

BTW: There is also added a test, but it's deactivated. Due to an issue with capability merging it can be activated with Selenium 4 (see #292 )

Type of change

Please delete options that are not relevant.

• Bug fix (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)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules