Please add option allow github copilot to rebase & force-push on pull request branch

[anatawa12]

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Product Feedback

Copilot Feature Area

Copilot Agent Mode

Body

I tried github copilot agent mode in vrc-get/vrc-get#2466 but it contains many unnecessary changes copilot made, especially for "Initial plan" commit with empty body.
I asked github copilot for rebasing commits with squishing few commits but copilot responded with impossible.
This makes I need to do manual rebasing before merge when simpler but non-squasing history is expected.

[github-actions[bot]]

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