Adds documentation for the Kubecost Admission Controller

[thomasvn]

What does this PR change?

• Adds documentation for the Kubecost Admission Controller

Does this PR rely on any other PRs?

• No

How does this PR impact users? (This is the kind of thing that goes in release notes!)

• N/a

Links to Issues or tickets this PR addresses or fixes

• This PR provides documentation for https://github.com/kubecost/kubecost-cost-model/pull/1813

What risks are associated with merging this PR? What is required to fully test this PR?

• None. Kubecost Admission Controller is not enabled by default.

How was this PR tested?

Validated that none of the Kubecost Admission Controller secrets, environment variables, templates were rendered in a default configuration.

helm template cost-analyzer

Have you made an update to documentation? If so, please provide the corresponding PR.

[chipzoller]

Thomas, great to see these comments. Thank you, it's super helpful. Can we perhaps also include a link to the docs (if extant?) which explain what this does and why a user wants/needs it?

[chipzoller]

You're linking to a PR in a private repository while this PR is in a public one just FYI.

[thomasvn]

@chipzoller No documentation currently exists for this feature, so for now I've opened up kubecost/docs#749. Does the rest of the PR look good for approval?

[chipzoller]

Yes, looks ok.