Release prep v4.15.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit a4130e5adc0b55f2dbe882c77123016640314956. Please verify before merging:

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

[mhashizume]

Closing and reopening to kick tests

[mhashizume]

The static code analysis check is failing because of the commit summary. This is fine and I don't mind overriding it here, but sometime in the future we should update the Rake task for the check to include "Release prep" the way we do in the core modules: https://github.com/puppetlabs/puppetlabs-augeas_core/blob/f2aa3957da62c467d24f241b545333a3759fe8e6/rakelib/commits.rake#L10

[AriaXLi]

The static code analysis check is failing because of the commit summary. This is fine and I don't mind overriding it here, but sometime in the future we should update the Rake task for the check to include "Release prep" the way we do in the core modules: https://github.com/puppetlabs/puppetlabs-augeas_core/blob/f2aa3957da62c467d24f241b545333a3759fe8e6/rakelib/commits.rake#L10

Just put up a PR for it since it seems like a quick fix! #669

[mhashizume]

Closing and reopening this PR to incorporate the changes from https://github.com/puppetlabs/puppetlabs-puppet_agent/pull/669