Azure / ARO-RP / 23518222387

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[ARO-7310] MIMO Scheduler (#4580)

* use generics for the bucket manager

* scheduler framework, mostly building off the actuator

* initial shaping

* don't need a dialer

* wiring up the caches

* poke at this a bit

* initial wiring up of the cluster caches and such

* use an interface in testlog

* initial pass at the calendar parsing + establishing the next window

* make the selector data struct from the cluster cache and add code to check them against a set of selectors

* add more of the test for the manager itself

* initial code to get the next runs to create the look forward windows and matching the selectors

* update for rebase

* weekday handling in calendar

* make mimo 2038 compliant :)

* updates

* basic tests and passing

* test cleanups, fixing the scheduleacross

* mimo scheduler executable entry point

* make the openshiftclusters scheduled by each obey the same bucketing as the actuator

* expand some of the mimo scheduler tests to cover branch cases

* add MIMO scheduler to database generator

* make generate

* cmdline work

* clea n up this and put it in the right spot

* initial admin API portions for mimo scheduler

* fix license headers

* schedules have a bucket 0, not bucket 1

* move create to handle put

* fix listening on different ports

* clean up manifests created for this schedule which don't match the declared schedule

* add selector data API to make it easier to see what a cluster's selectordata is

* in schedule put, verify that the calendar schedule is valid too

* add tests for the logging

* fix for cancelling already cancelled manifests

* cleanup

* copy paste fails, thx @cloudygreybeard for spotting

* add scheduler to VMSS

* cleanups for sorting to prevent flake

* testing for the selectors

* batch cancel

* add a GET for individual schedules

* update some of the docs

* add some metrics faking

* add metrics to the schedule loop

* update tests in service + add metric

* fix errorf

* clean up how t... (continued)

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