KEP: Introduce a new timeout to WaitForPodsReady config

[PBundyra]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Described in #2732

Which issue(s) this PR fixes:

Part of #2732

Special notes for your reviewer:

As an alternative, instead of adding a new timeout, we could reuse the existing one to provide the needed functionality

Pros:

• no API changes requried

Cons:

• Users cannot set different timeouts for different scenarios

Does this PR introduce a user-facing change?

NONE