Correctly mock out getDockerImageDigest for testing buildAndMaybePush

[IRCody]

Fixes a test for cc buildAndMaybePush that was failing because runDockerCmd was being called twice.

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• Wrangler / Vite E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: non e2e test change only.
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: test change only
• Wrangler V3 Backport
  • TODO (before merge)
  • Wrangler PR:
  • Not necessary because: test doesn't exist in v3.

[changeset-bot]

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Latest commit: f55b726

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commit: f55b726