Add support for Terra Functional Testing

[picimako]

Summary of scope

The Terra Functional Testing library has been released, and will replace terra-toolkit. See Upgrade guide.

Solution details

• [x] Update screenshot name resolution to recognize new screenshot names.
• [x] Handle theme folders under snapshots.
• [x] Update context string in screenshot comparison editors.
• [x] Check if unused screenshot finding logic needs any update.

Inspections

• [x] Create inspection to validate that the name of a screenshot is specified in Terra.validates calls. See Terra Commands and Screenshots.
• [x] No screenshots within the same spec file should be identical. See Screenshots
• [x] Create inspection and quick fixes to migrate Terra.it helpers to Terra.validates calls: https://github.com/picimako/terra-support/issues/44
• [x] The viewports property is no longer valid for Terra.validates calls. See Terra Commands
• [x] misMatchTolerance is not a valid property name, terra-functional-testing uses mismatchTolerance. See property assignment in terra-functional-testing/element.js.

References

• [x] Update reference resolution logic and item presentation with theme.

Quick Documentation

• [x] Add the Upgrade guide as reference to quick documentations if terra-functional-testing is the selected test library. Check all relevant elements: Terra, validates, element, screenshot

Find out if there is any other requirement that needs to be covered.

Out of scope

• N/A

[picimako]

Completed on release branch.