VPA: Add option to set the webhook failurePolicy to Fail

[adrianmoisey]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Allows a user to set the failurePolicy of the VPA webhook

Which issue(s) this PR fixes:

Fixes #7180

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Add --webhook-failure-policy-fail flag to admission-controller to allow web hook failurePolicy to be set to Fail

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[adrianmoisey]

@kwiesmueller any chance you can look at this?

[kwiesmueller]

/assign @voelzmo @raywainman

[raywainman]

/lgtm

[raywainman]

Can we be explicit here that if not using --vpa-object-namespace to isolate this to a set of namespaces that we recommend minimally setting --ignored-vpa-object-namespaces=kube-system?

[adrianmoisey]

Good idea! Added in 205b978

[adrianmoisey]

@raywainman Your suggestion has been made

[raywainman]

/lgtm

[adrianmoisey]

@kwiesmueller any chance you can review now?

[kwiesmueller]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adrianmoisey, kwiesmueller

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