Add configurable fetch-depth to Danger-enabled workflows

[Copilot]

Danger fails with "couldn't find remote ref refs/heads/danger_head" when git history is too shallow to resolve the merge base between PR branches.

Changes

• Added FETCH_DEPTH input to android-cloud-check.yml
• Added fetch_depth input to ios-selfhosted-test.yml and ios-kmp-selfhosted-test.yml
• Defaults to 1 (preserves current shallow clone behavior)
• Set to 0 to fetch full history when Danger merge base errors occur

Usage

# Android
uses: futuredapp/.github/.github/workflows/android-cloud-check.yml@main
with:
  FETCH_DEPTH: 0

# iOS
uses: futuredapp/.github/.github/workflows/ios-selfhosted-test.yml@main
with:
  fetch_depth: 0

Naming follows existing conventions in each workflow (uppercase for Android, lowercase for iOS).

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