Retry the upload and first poll in test_target_summary

[adamtheturtle]

Fixes #3354.

test_target_summary asserted tracking_rating == -1 from one summary report taken immediately after adding a target. The real VWS reports -1 for only a short time after an upload before publishing the image's rating while the target is still processing, so a single immediate poll can miss the window and see the settled rating instead. Because AssertionError is not retried by pytest-retry, this made the Real Vuforia job red whenever it happened.

The assertion stays strict. The upload and first poll now live in a helper which is retried with tenacity on AssertionError, up to five attempts, uploading a fresh target each time. A rating never returns to -1 once it has left it, so polling the same target again would be no use. A comment on the helper explains the window and why the retry is there, and notes that this makes a miss unlikely rather than impossible.

Ran tests/mock_vws/test_target_summary.py against the in-memory mock, the in-memory Docker application, and Real Vuforia locally: 20 passed. Also exercised the retry path with a stub client to confirm it re-uploads a fresh target and reraises after the attempts are exhausted.

🤖 Generated with Claude Code