Bug: Make Viewport Highlighting Configurable

[wurzelkuchen]

Quick Description

Currently the default of our full page screenshots is to blur the parts outside the viewport for a better highlighting (if the highlighting is enabled). Downside of this approach is, that we might have made it difficulty to read small error message outside the viewport.
The blurring should be configurable.

User Story

As a report reviewer,
I want to be able to see the parts of the screenshots which are not in the viewport unblurred, but still see the highlighting where the viewport was
so that I can see error messages which are displayed outside the viewport more easily.

Functional Requirements

• Add configuration toggle for blurring the fullpage screenshots.
• Make the non blurred way the default.

Documentation Requirements

• Document the new toggle.

Test Requirements

• Smoke test this feature in an external test suite.