How to add code sandbox link to test pipeline-editor PR's without local dev build

[marthacryan]

To test a pipeline-editor PR without having to build the pipeline-editor changes locally:

1. Find the PR in the pipeline-editor repo: https://github.com/elyra-ai/pipeline-editor/pulls

2. Scroll to the bottom of the PR and click "Show all checks"

3. Scroll to the bottom of the list of checks and find "ci/codesandbox" - click the "Details" button

4. Copy the link that ends with 'pipeline-editor' in the "Local Install Instructions" (if there are changes to the pipeline-services you'll want to repeat steps 4-6 with the link that ends with 'pipeline-services')
   

5. If the changes in the pipeline-editor repo have a corresponding PR in the elyra repo, make sure you have those changes checked out locally

6. In the elyra repo, open packages/pipeline-editor/package.json and find "@elyra/pipeline-editor" under "dependencies":
   
   And replace the version number with the link copied in step 4:
   

7. make clean install from the elyra root directory