Please remove Build Azure Virtual Machine Image from GitHub Marketplace

[Build Azure Virtual Machine Image](https://github.com/marketplace/actions/build-azure-virtual-machine-image) appears prominently in the marketplace:

https://github.com/marketplace?query=Azure+Virtual&type=actions

There's no need to list an action on the marketplace unless you're:

* Supporting it
* Looking for more consumers

Anyone can use any public github.com repository as an action source regardless of whether it is published to the marketplace.

This action isn't usable:

* It's using `node12` which hasn't been supported since [August 2023](https://github.blog/changelog/2023-07-17-github-actions-removal-of-node12-from-the-actions-runner/):
https://github.com/Azure/build-vm-image/blob/49519e8b4a718414222fa83243bc6bc019a3edf1/action.yml#L62

There haven't been any commits since 2022: https://github.com/Azure/build-vm-image/commits/master/

There's no reason to continue advertising an action that won't work.