Add --enable-provisioning-requests flag

[yaroslava-serdiuk]

What type of PR is this?

/kind feature

Fixes #6814

Check-capacity was tested manually. The following scenarious were tested:

• 1 ProvReq, cluster doesn’t have capacity, verify Provisioned=False
• 1 ProvReq, cluster has capacity which is used by real pods, verify Provisioned=False
• 1 ProvReq, cluster has capacity, verify Provisioned=True
• 1 ProvReq, multiple pod templates, only 1 pod template could fit, verify Provisioned=False
• 2 ProvReqs, each ProvReq could fit, but not both of them. Verify only 1 ProvReq has Provisioned=True, when BookingExpired=True, second ProvReq has Provisioned=True.

/assign @MaciekPytel

[yaroslava-serdiuk]

/assign @towca

[MaciekPytel]

/lgtm
/approve

We've discussed with Karpenter team and agreed to allow an opt-in beta in CA 1.30.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MaciekPytel, yaroslava-serdiuk

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