Jenkinsfile.public: re-enable satellite UI tests

[mobyvb]

These were previously removed due to flakiness/unreliability. The tests are being added back for a few reasons:

• updates have been made to make test-satellite-ui to avoid caching, which was causing flakiness
• there is no clear evidence that the Github failures in the past were Github-specific, and UI tests on Gerrit have been passing consistently for several weeks (Jenkinsfile.verify)
• We need to execute satellite UI tests in Jenkinsfile.public to prevent ui-test-breaking changes merged via Github PRs

Change-Id: I71ca6e0bf4c98f7b929e54db405196245324010a

What:

Why:

Please describe the tests:

• Test 1:
• Test 2:

Please describe the performance impact:

Code Review Checklist (to be filled out by reviewer)

• NEW: Are there any Satellite database migrations? Are they forwards and backwards compatible?
• Does the PR describe what changes are being made?
• Does the PR describe why the changes are being made?
• Does the code follow our style guide?
• Does the code follow our testing guide?
• Is the PR appropriately sized? (If it could be broken into smaller PRs it should be)
• Does the new code have enough tests? (every PR should have tests or justification otherwise. Bug-fix PRs especially)
• Does the new code have enough documentation that answers "how do I use it?" and "what does it do?"? (both source documentation and higher level, diagrams?)
• Does any documentation need updating?
• Do the database access patterns make sense?