Cherry-pick for v2.12.0

[simster7]

• Alex Collins: refactor(controller): Enhanced pod clean-up scalability (refactor(controller): Enhanced pod clean-up scalability #4728) (69ce2ac)
• Alex Collins: test: Improved e2e test robustness (test: Improved e2e test robustness #4758) (549585f)
• Simon Behar: feat: Add a minimal prometheus server manifest (feat: Add a minimal prometheus server manifest #4687) (9c4d735)
• Alex Collins: fix(ui): Remove unused Heebo files. Fixes 'heebo.css' requests always return html root #4730 (fix(ui): Remove unused Heebo files. Fixes #4730 #4739) (625e3ce)
• Alex Collins: fix(controller): Fixes resource version misuse. Fixes Argo UI: Unknown error #4714 (fix(controller): Fixes resource version misuse. Fixes #4714 #4741) (2e278b0)
• Alex Collins: fix(controller): Requeue when the pod was deleted. Fixes Allow grace before marking nodes as error + "pod deleted" #4719 (fix(controller): Requeue when the pod was deleted. Fixes #4719 #4742) (300db5e)
• Yuan Tang: fix(executor): Copy main/executor container resources from controller by value instead of reference (fix(executor): Copy main/executor container resources from controller by value instead of reference #4737) (122c5fd)
• Yuan Tang: fix(controller): Fix incorrect main container customization precedence and isResourcesSpecified check (fix(controller): Fix incorrect main container customization precedence and isResourcesSpecified check #4681) (55019c6)
• Yuan Tang: feat(controller): Allow to configure main container resources (feat(controller): Allow to configure main container resources #4656) (b1e2c20)

[alexec]

fix(controller): Requeue when the pod was deleted. Fixes #4719 (#4742) (300db5e) only need to be cherry-picked if the original was already cherry-picked. You'll know if that's the case because the cherry-pick will conflict.

[alexec]

Done.

[simster7]

Released