feat: add the pending manifest list

[ryanzhang-oss]

Description of your changes

Add the pending manifest list to the placement status

I have:

• Run make reviewable to ensure this PR is ready for review.

How has this code been tested

Integration tested

Special notes for your reviewer

This is part 5 of the series of PRs that leads to (mostly) workload orchestration code completion with integrated tests.

[Fei-Guo]

Can we postpone this api change until users really want to know the list?

To me, if the crp condition is not successful and there are no failed placements populated, all resources are pending.

[ryanzhang-oss]

Can we postpone this api change until users really want to know the list?

To me, if the crp condition is not successful and there are no failed placements populated, all resources are pending.

yes, that's why the API says we only mark a resource as pending after a configurable time. Otherwise, all the resources are pending right after a schedule.

Currently, I am putting those manifests that are not picked up after a configurable time to the failed list which seems not a good idea.

We can either go with what you said (which is a lot simpler to implement).

[ryanzhang-oss]

we will not add the pending list, for now, it's in-memory.