Enhance regular expression for NONE release note variations
Enhance regular expression for NONE release note variations

This enhances the release notes regex for matching any quoted variant of
case insensitive `NONE`s, as well as contributors who specify
`release-notes` instead of `release-note`.

Signed-off-by: Sascha Grunert <70ab469ddb2ac3e35f32ed7c2fd1cca514b2e879@suse.com>

kubernetes/release,kubernetes/release