[ui-test][fix] increase timeout, don't skip sites

[AlexRRR]

Description

fixes two issues introduced to the UI test module:

• forms tests may exceed the mocha timeout, increase to 4 mins.
• reverting skip of sites test case.

Types of changes

• 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 change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.