Add local built K8s images support in conformance test on Kind workflow

[luolanzone]

At the moment, we have a manual workflow to allow developers to run conformance test against different K8s versions.
https://github.com/antrea-io/antrea/blob/main/.github/workflows/conformance.yml
But it can only run those K8s versions which have been supported in kind repo, in most cases, we'd like to run Antrea with latest K8s versions which can help us to find the compatibility issues ASAP.

According to Kind README, users can build Kind Node images from K8s sources codes with following command, this allow us to build our own Node images and run the conformance test against the latest K8s version as earlier as possible. So it should be doable to add local built K8s Node image support to run conformance test workflow with a new parameter to specify a K8s commit or version tags.

kind build node-image
kind create cluster --image kindest/node:latest