Introduce idea of PR without Issue as part for user defined chapters

[miroslavpojer]

Background

Projects can contain PR without Issue as a valid object. (Valid means that the issue is not present by purpose.)

• dependabot PRs (project config defined tag dependencies)
• bug fixes (user defined tag bugfix)

Feature

Introduce logic to identify the PRs without Issues as valid lines in user-defined chapters.
Logic will identify PRs without the issues mentioned and check if labels are present.
If tag defined by user are present PRs will be placed to defined chapters.

[github-actions]

Release notes

• Implemented logic to add PR without linked issue to custom chapters.
• Add logic that marks duplication of records in customer-defined chapters.