document using AppWrappers to run wrapped custom Jobs

[dgrove-oss]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Documents how the AppWrapper integration can be leveraged to run custom Jobs.

Which issue(s) this PR fixes:

Fixes #3975

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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