chore: Update result reporting

[castastrophe]

Visual regression test reporting for pull requests

This PR adds a json output to the wdio config which can be used by the Test reporter action to the pull request in a summarized view that is easier for users to parse for meaning.

Related issues

• #1350 Visual regression testing challenges

Testing instructions

• Validate pull request opened, in draft state, no labels
  1. Open a new pull request against chore-report-results with a small, non-breaking change
  2. All tests should be skipped
• Validate pull request opened, not draft, no labels | passing tests
  1. Use the previous PR, change state to ready for review
  2. Should skip e2e tests, no results reported
• Validate pull request opened, not draft, label run e2e | passing tests
  1. Use the previous PR but add the run e2e label
  2. Should run e2e tests, report back results, pass the new action step
• Validate pull request opened, not draft, no labels | failing tests
  1. In the previous PR, delete a chunk of one of the demo pages to cause a failing test for e2e
  2. Should run e2e tests, report back failure, fail the new action step
• Validate pull request opened, not draft, label skip vrt
  1. Use the previous PR but add the skip vrt label
  2. Should skip e2e tests, no results reported

Ready-for-merge Checklist

• Expected files: all files in this pull request are related to one request or issue (no stragglers or scope-creep).
• Documentation (README.md, WHY.md, etc.) updated or added.

Merging

Please squash when merging and ensure your commit message uses conventional commit formatting.

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