C3: Stop running e2e on forks

[jculvey]

What this PR solves / how to test

This is an attempt to resolve the problem of C3 e2e tests being run on forks. Each workflow currently checks if: github.repository_owner == 'cloudflare', but despite this c3 e2e tests are still being run on forks. Docs seem to indicate that this doesn't need to be escaped as an expression ${{ }}, but it seems worth a shot anyway.

Here's a few recent examples:

#5547
#5483
#5482
#5458

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
  • Not necessary because: no functionality changed
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because: no user facing changes
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/...
  • Not necessary because: no user facing changes

[changeset-bot]

⚠️ No Changeset found

Latest commit: dac57e0

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-wrangler-5596

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5596/npm-package-wrangler-5596

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-wrangler-5596 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-create-cloudflare-5596 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-cloudflare-kv-asset-handler-5596

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-miniflare-5596

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-cloudflare-pages-shared-5596

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8651657627/npm-package-cloudflare-vitest-pool-workers-5596

Note that these links will no longer work once the GitHub Actions artifact expires.

---

wrangler@3.50.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240405.1
workerd	1.20240405.0	1.20240405.0
workerd --version	1.20240405.0	2024-04-05

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