Create nightly dev release workflow

[desertaxle]

First check

• [X] I am a contributor to the Prefect codebase

Description

• Create a new workflow to create a prerelease in GitHub every night. Workflow will also be triggerable manually.
• Each prerelease will create a tag in the format: {major}.{minor}.{micro}.devYYYYMMDD.{counter}
  • The first dev release on July 1st (assuming we’re still on RC9) would be 3.0.0.dev20240701.1
  • The date included with the version will help sort versions.
  • The counter ensures we can release multiple times a day if needed.
• Release notes for each dev release use GitHub’s auto-generated release notes feature.

Impact

No response

Additional context

No response