fix: exclude Copilot bot from auto-labeling PRs

[Copilot]

GitHub Copilot PRs were automatically receiving inappropriate component/package labels (Component: Link, Component: Slider, Package: charting, etc.) and "PR: API Modified" labels via the GitOps bot rules.

Changes

Modified .github/policies/botRules.yml to exclude github-copilot[bot] from two auto-labeling rules:

• File-based labeling (line 318): Skips component/package labels based on modified file paths
• API Modified labeling (line 554): Skips "PR: API Modified" label when API files change

Both rules now check the PR author is not github-copilot[bot]:

- if:
    - payloadType: Pull_Request
    - not:
        isActivitySender:
          user: github-copilot[bot]
  then:
    # existing labeling logic

Human-authored PRs continue receiving automatic labels unchanged. Other bot rules (e.g., "Status: In PR" sync) remain active for all PRs.

Original prompt

When PR is open by copilot, strange label and project assigment occurs for particular PR.

following things should not happen:

• @microsoft-github-policy-service microsoft-github-policy-service bot added Component: Link Component: Pivot Component: Slider Component: Toggle Package: charting Package: date-time Package: experiments Package: styling PR: API Modified labels on Aug 13
• Copilot AI changed the title [WIP] [Feature]: propagate no-missing-jsx-pragma workspace rule to public feat: propagate no-missing-jsx-pragma rule to public eslint plugin

Assumption is that this is triggered by the bot following these rules https://github.com/microsoft/fluentui/blob/master/.github/policies/botRules.yml

This behaviour is wrong and shouldn't occur to avoid assigment of non relevant tags and projects

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