Please remove chainalert action from GitHub Marketplace

[jsoref]

ChainAlert appears prominently in the marketplace:

https://github.com/marketplace?query=ChainAlert

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.com/Checkmarx/chainalert-github-action/blob/84a28df70741c9d82f87336bbe4b565fe0e57aba/action.yml#L14

There haven't been any commits since 2022: https://github.com/Checkmarx/chainalert-github-action/commits/master/

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