Workflows: fix getting a workflow when such workflow was not yet created

[bruxodasilva]

Fixes WOR-440.

Fixed a bug in local development where fetching a Workflow instance by ID would return a Workflow status, even if that instance did not exist. This only impacted the get() method on the Worker bindings.

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: workflows does not have them
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: bugfix

[changeset-bot]

🦋 Changeset detected

Latest commit: e210366

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudflare/workflows-shared	Patch

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[github-actions]

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---

wrangler@3.95.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241205.0
workerd	1.20241205.0	1.20241205.0
workerd --version	1.20241205.0	2024-12-05

Please ensure constraints are pinned, and miniflare/workerd minor versions match.