Retry API requests when a HTTP 503 "Service unavaliable" is received

Closes: #6 (closed)

Also puts in a sanity check for users missing 'orgUnitPath', at least helping to identify the issue with #8 (closed) (if not closing)

Note: failed to get any 503 while testing - probably have to let it out in the wild and wait for pipeline failures

changed milestone to %Sprint 79

approved this merge request

mentioned in commit 25f3c97f

merged

mentioned in commit uis/devops/tools/linkedin-learning-entitlements@8ea24b2d