Fix duplicate parameter in github merge flow

[jjonescz]

The branch merge workflow seems to be completely broken in the sdk repo these days with errors like:

Run D:\a\sdk\sdk\arcade-repository\.github\workflows\scripts\inter-branch-merge.ps1 -RepoName sdk -RepoOwner dotnet -MergeFromBranch $env:GITHUB_REF_NAME -MergeToBranch main -ResetToTargetPaths "" -QuietComments -ResetToTargetPaths global.json;NuGet.config;eng/Version.Details.xml;eng/Version.Details.props;eng/common/*
inter-branch-merge.ps1: D:\a\_temp\99bd6d72-4688-4ba6-a447-0fd0ca3d76d0.ps1:2
Line |
   2 |  … ain -ResetToTargetPaths "" -QuietComments -ResetToTargetPaths global. …
     |                                              ~~~~~~~~~~~~~~~~~~~
     | Cannot bind parameter because parameter 'ResetToTargetPaths' is specified more than once. To provide multiple
     | values to parameters that can accept multiple values, use the array syntax. For example, "-parameter
     | value1,value2,value3".
Error: Process completed with exit code 1.

I believe this PR should fix that.

[Copilot]

Pull request overview

This PR fixes a critical issue in the inter-branch merge workflow that was causing automation failures due to duplicate PowerShell parameters. The workflow script was receiving -ResetToTargetPaths specified twice - once as an empty default value and again with actual file paths from the ExtraSwitches configuration.

Key Changes:

• Extracted ResetToTargetPaths parameter from ExtraSwitches into a dedicated property across all merge flow configurations
• Standardized configuration structure to prevent PowerShell parameter binding errors

[jjonescz]

/ba-g CI skipped

[jjonescz]

/ba-g CI skipped