Optimize post-deploy-test job

[drodowic]

Description 🛠

• watch build queue to verify build started
• reduce backoff limit so that only one trigger is issued
• increase default memory request to meet cluster minimum

AAH-1212

Reviewer Checklists 👀

Developer reviewer:

• Code looks sound, good architectural decisions, no code smells
• There is a Jira issue associated (note that "No-Issue" should be rarely used)
• Tests are included in galaxy_ng/tests/integration or galaxy_ng/tests/functional, and they fully cover necessary test scenarios… or tests not needed

QE reviewer (exceptions):

• Tests are included in galaxy_ng/tests/integration or galaxy_ng/tests/functional, and they fully cover necessary test scenarios… or tests not needed
• PR meets applicable Acceptance Criteria for associated Jira issue

Note: when merging, include the Jira issue link in the squashed commit

[drodowic]

/retest