`make run-on-kind` enhancements

By default, `make run-on-kind`
- builds and uses local images for `bpfman-operator` and `bpfman-agent`
- uses the remote version of `quay.io/bpfman/bpfman:latest`

Consider adding the following new options:

`BPFMAN_LOCAL=1 make run-on-kind`
- uses the local version of whatever `BPFMAN_IMG` is set to
- by default, this is the local version of `quay.io/bpfman/bpfman:latest`

`BPFMAN_REMOTE=1 make run-on-kind`
- use the remote versions of everything
- This allows someone to quickly spin up a cluster w/bpfman without building anything for kicking the tires or testing.

_Originally posted by @anfredette in https://github.com/bpfman/bpfman-operator/issues/113#issuecomment-2316075225_

Start by locating the Makefile entry point for `run-on-kind` and tracing how it selects local or remote images and the `BPFMAN_IMG` value. Done means the default behavior remains unchanged, `BPFMAN_LOCAL=1` uses the local bpfman image, and `BPFMAN_REMOTE=1` uses remote images for everything.

Written by the indexing model from the issue text.