[release-0.11] Reconcile Cohort when FairSharing Weight Updated

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4963

/assign tenzen-y

Fix bug where update to Cohort.FairSharing didn't trigger a reconcile. This bug resulted in the new weight not being used until the Cohort was modified in another way.

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[tenzen-y]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ff6c47802e2d791d0d8a1d258469d5b35ed76035

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot, tenzen-y

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[mimowo]

/kind bug