Allow for numeric pre release tags

[carlos-vicente]

Description

Changed the pre-release tag formatting to support numeric pre-release tags.

Related Issue

Fixes #2235

Motivation and Context

This will provide the ability to correctly use pre-release tags with the format: Release-..- and getting that correct version on the FullSemVer (and related variables).

How Has This Been Tested?

On a git repo using git flow, on a release branch called release/Release-2.10, tagged with Release-2.10.0-1, the numberic pre-release tag got formatted correctly and got

{ 
  "PreReleaseTag":"1",
  "PreReleaseTagWithDash":"-1",
  "PreReleaseLabel":"",
  "PreReleaseNumber":1,
  "WeightedPreReleaseNumber":1,
  "MajorMinorPatch":"2.10.0",
  "AssemblySemVer":"5.13.0.10",
  "AssemblySemFileVer":"5.13.0.10",
  "FullSemVer":"5.13.0-1"
  // remaining fields omitted
}

using the config:

mode: ContinuousDelivery
tag-prefix: '[Rr]elease-'
assembly-versioning-scheme: MajorMinorPatchTag
assembly-file-versioning-scheme: MajorMinorPatchTag
ignore:
  sha: []
merge-message-formats: {}

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.

[asbjornu]

Thank you so much for your contributions to GitVersion, @carlos-vicente! 🙏