Add support for Squash Commit releases

[DSpirit]

Extended the TryParse operation to check whether the commit source branch is a release branch in order to support increment of merges from release into main branch when a squash merge has been applied.

Motivation and Context

Discussion

How Has This Been Tested?

• Local tests with only one merge commit worked
• Extended the MergeMessageBaseVersionStrategyTests.cs with a test using the false flag on IsMergeCommit

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[DSpirit]

@asbjornu I've created a clean PR due to merge conflicts.
Here I've fixed the failing hotfix tests and applied the changes you've requested. Would be glad if you could take another look!

[mergify]

Thank you @DSpirit for your contribution!

[arturcic]

🎉 This issue has been resolved in version 6.0.0-rc.1 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

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