H-1323: Add `/workers` page, update flow run routes

[CiaranMn]

🌟 What is the purpose of this PR?

The PR introduces a /workers page which lists all active worker runs. These may be 'goals' which are research-driven flows (the /goals page to be introduced in the next PR), or other flows.

It also updates the routes for viewing:

1. Flow definitions to /@[namespace]/flows/[id]
2. Worker runs (flows or goals) to /@[namespace]/workers/[id]

These routes have essentially the same UI for now so they share a component. I've also updated the context providers so that we poll for all flow runs with fewer details (that doesn't require the event history) on a slower schedule, and the single selected flow run more frequently.

🔗 Related links

• Design (internal)

🔍 What does this change?

As well as the main changes above:

• Throws errors without a cause from run-workflow-run.ts because the cause causes Temporal to not fail the workflow properly
• Update the persistFlow activity to use the provided webId instead of always the user

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• [x] does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• [x] are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• [x] do not affect the execution graph

🛡 What tests cover this?

• None yet.