skip-release-notes should allow multiple entires

[benedeki]

Background

skip-release-notes setting of the action allows to mar Issues that the contributors don't want to have release notes for.
But one value is not enough. It's enough for explicit setting, but it would be convenient to add whole groups of issues. Like questions or releases, which usually have their own labels.

Feature

Allow skip-release-notes to accept a set of values, not just one.

[miroslavpojer]

This is related newly only for GH workflow - to disable GH check.