Adding support to override default author commit for github PRs

[mahenrique94]

Hey, I just made a Pull Request!

Adding support to override the default commit author when opening PRs using GitHub action (according publish action does):

gitAuthorName: Author name...
gitAuthorEmail: Author email...

:heavy_check_mark: Checklist

• [x] A changeset describing the change and affected packages. (more info)
• [x] Added or updated documentation
• [x] Tests for new functionality and regression tests for bug fixes
• [x] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @backstage/plugin-scaffolder-backend

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/plugin-scaffolder-backend-module-github	plugins/scaffolder-backend-module-github	patch	v0.2.8-next.2
@backstage/plugin-scaffolder-backend	plugins/scaffolder-backend	none	v1.22.6-next.2

[github-actions[bot]]

Uffizzi Cluster pr-24628 was deleted.

[JohnAllenTech]

Oh wow this is really cool. This fixes a major blocker for me

[github-actions[bot]]

Thank you for contributing to Backstage! The changes in this pull request will be part of the 1.27.0 release, scheduled for Tue, 14 May 2024.