[vitest-pool-workers] add disableRetryDelays() to skip retry backoff delays in workflow tests

[repository]

when testing a workflow step that has retry configuration, the backoff between retries will actually take effect even when the step results are full mocked, and burn real wall-time for no reason. this behavior still persists even when disableSleeps() is called on the workflow.

this changes adds a new method disableRetryDelays() to WorkflowInstanceModifier, similar to disableSleeps(), which will cause the retry to occur immediately instead of after the configured backoff time. this can also be done to only specific steps as well.

 // disable all retry delays
 await instance.modify(m => m.disableRetryDelays());

 // disable for specific steps only
 await instance.modify(m => {
   m.disableRetryDelays([{ name: "go take a nap and eat a sandwich" }]);
 });

---

• 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): [workers] document disableRetryDelays() for workflow testing cloudflare-docs#28935
  • Documentation not necessary because:

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a cat i saw outside of the austin office last summer

---

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Latest commit: 8228ce6

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[workers-devprod]

Codeowners approval required for this PR:

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• packages/vitest-pool-workers/types/cloudflare-test.d.ts: [@cloudflare/wrangler]
• packages/workflows-shared/src/context.ts: [@cloudflare/workflows @cloudflare/wrangler]
• packages/workflows-shared/src/modifier.ts: [@cloudflare/workflows @cloudflare/wrangler]
• packages/workflows-shared/tests/context.test.ts: [@cloudflare/workflows @cloudflare/wrangler]

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commit: 8228ce6

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• packages/vitest-pool-workers/types/cloudflare-test.d.ts: [@cloudflare/wrangler]
• packages/workflows-shared/src/context.ts: [@cloudflare/workflows @cloudflare/wrangler]
• packages/workflows-shared/src/modifier.ts: [@cloudflare/workflows @cloudflare/wrangler]
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[pombosilva]

Looks great! Left a few comments

Can you also add the usage of this new handler to fixtures/vitest-pool-workers-examples/workflows/?