[Workflows] Add step context with attempt count

[pombosilva]

Fixes WOR-1054.

Adds step context with attempt count for step.do() callbacks. This allows to access the current step attempt number within their step (this is 1-indexed).

This change is backward compatible with JS workflows, however it would break Python workflows - here is the PR to prevent that.

Types will be added in a follow-up PR to workerd.

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: We will add after all changes get released (internal + workerd)

A picture of a cute animal (not mandatory, but encouraged)

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[changeset-bot]

🦋 Changeset detected

Latest commit: 45138e0

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

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commit: bc797cc

[Caio-Nogueira]

Looks good, but we need to wait until this additional argument is passed in workflows production as well

[github-actions]

✅ All changesets look good

[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/workflows
• ✅ @cloudflare/wrangler

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