perf: Cache the pod request calculation in memory

[jonathan-innis]

Fixes #N/A

Description

Cache pod request calculations in memory during scheduling -- this prevents us from calling requests.RequestsForPods a ton of times during the scheduling simulation which causes us to reconstruct the requests. We can calculate this once at the beginning of the scheduling simulation and then just reached for the pre-computed cached value anytime we are trying to use a pod's requests

How was this change tested?

make presubmit

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[coveralls]

Pull Request Test Coverage Report for Build 11883702745

Details

• 19 of 19 (100.0%) changed or added relevant lines in 4 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 81.024%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/controllers/disruption/consolidation.go	4	88.55%

Totals
Change from base Build 11882312260:	-0.03%
Covered Lines:	8625
Relevant Lines:	10645

---

💛 - Coveralls

[engedaam]

/lgtm

[jmdeal]

/hold
There's one more occurrence in NodeClaim which isn't using the cached value on line 110.

[jmdeal]

/lgtm
/unhold