Release prep v8.0.0

[github-actions]

Automated release-prep through pdk-templates from commit 9a9e53e.
Please verify before merging:

• last nightly run is green
• Changelog is readable and has no unlabeled pull requests
• Ensure the changelog version and metadata version match

[CLAassistant]

All committers have signed the CLA.

[bastelfreak]

The CI uses the wrong puppet-strings version and will convert the whole REFERENCE.md. IMO that should be fixed first.

[Ramesh7]

The CI uses the wrong puppet-strings version and will convert the whole REFERENCE.md. IMO that should be fixed first.

Hi @bastelfreak, we are working on that puppet-string issue, earlier we observed that the issue is due to bundler version which was using 2.4.10 which we updated to 2.4.22 and observed things are working fine on our testing module https://github.com/puppetlabs/puppetlabs-testing/actions/runs/6959591856/job/18937167963#step:6:185.
Now we are trying same thing here but seems here its still referring old version of puppet-string. we are still investigating this issue and keep you posted.

Meanwhile just to unblock you have re-generated REFERENCE.md from local and updated PR.