Hide/Show build image accordingly

[pacostas]

Summary

Use Cases

This PR excludes or includes build image details according to if build_image parameter has been set or not.

In case the build_image parameter has been set, then the output is as it was in the past

## Images
Build: `build_image_url`
Run: `run_image_url`

## Patched USNs
No USNs patched in this release.

## Build Image Package Changes
### Added
No packages added.

### Modified
No packages modified.

### Removed
No packages removed.

## Run Image Package Changes
### Added
No packages added.

### Modified
No packages modified.

### Removed
No packages removed.

In case the build_image parameter has not been set, the output will be:

## Image - `run_image_url`

## Patched USNs
No USNs patched in this release.

## Run Image Package Changes
### Added
No packages added.

### Modified
No packages modified.

### Removed
No packages removed.

Merge after

• https://github.com/paketo-buildpacks/github-config/pull/938

Checklist

• [x] I have viewed, signed, and submitted the Contributor License Agreement.
• [ ] I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• [x] I have added an integration test, if necessary.
• [x] I have reviewed the styleguide for guidance on my code quality.
• [x] I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[mhdawson]

To add some context, for the ubi stack there are multiple run images. We use the existing functionality to create the release notes for each of the run images and therefore when calling to create the releases notes for the run image we only want the section for the run image not the build image.

[mhdawson]

@pacostas did you intended to have the commit which is related to the usns in this PR?

[pacostas]

@pacostas did you intended to have the commit which is related to the usns in this PR?

Yeap, you are right, removed it, thank you!