Fix github-merge-flow.jsonc format: separate ResetToTargetPaths from ExtraSwitches

[Copilot]

The github-merge-flow.jsonc file had incorrect JSON structure where ResetToTargetPaths was embedded as a command-line argument string within ExtraSwitches rather than as a separate array field.

Changes

• Restructured each branch configuration to have ResetToTargetPaths as its own JSON array field at the same level as ExtraSwitches
• Simplified ExtraSwitches to contain only -QuietComments
• Converted path format from semicolon-separated string to proper JSON array

Before/After

// Before
"release/8.0.1xx": {
    "MergeToBranch": "release/8.0.4xx",
    "ExtraSwitches": "-QuietComments -ResetToTargetPaths global.json;NuGet.config;eng/Version.Details.xml;eng/Versions.props;eng/common/*"
}

// After
"release/8.0.1xx": {
    "MergeToBranch": "release/8.0.4xx",
    "ExtraSwitches": "-QuietComments",
    "ResetToTargetPaths": [
        "global.json",
        "NuGet.config",
        "eng/Version.Details.xml",
        "eng/Versions.props",
        "eng/common/*"
    ]
}

Applied to all 7 branch configurations: release/8.0.1xx, release/8.0.4xx, release/9.0.1xx, release/9.0.3xx, release/10.0.1xx, release/10.0.2xx, and dnup.

Original prompt

The format of https://github.com/dotnet/sdk/blob/main/github-merge-flow.jsonc is incorrect. It looks like ResetToTargetPaths should be it's own node under ExtraSwitches which is a json array object. Can you modify that file to have that format for each entry?

Here's an example I found from another repo.
"ExtraSwitches": "-QuietComments",
"ResetToTargetPaths": [
"eng/Version.Details.xml",
"eng/Version.Details.props"
]

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[jjonescz]

I have already merged a similar fix: #52344