Streamline cloud-sdk-go release.

[gigerdo]

• Removes the changelog generation action
  • This step always fails since first changelogs have to be added manually
• ECE_VERSION is not automatically updated anymore
  • We potentially release multiple times per ECE version, so it should not be increased every time.
• Updated docs to reflect the new flow.

The release will now work like this:

• Update ECE_BRANCH, ECE_VERSION (if necessary)
• Generate new API and commit
• Write changelog entries, generate changelog, commit
• Run make tag

Description

Related Issues

Motivation and Context

How Has This Been Tested?

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Refactoring (improves code quality but has no user-facing effect)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation

Readiness Checklist

• [ ] My code follows the code style of this project
• [ ] My change requires a change to the documentation
• [ ] I have updated the documentation accordingly
• [ ] I have added tests to cover my changes
• [ ] All new and existing tests passed