H-2711, H-2712, H-2715: Add `/goals` and `/goals/new` pages

[CiaranMn]

🌟 What is the purpose of this PR?

Adds the following pages:

1. /goals, which lists all active goal tasks (goals are research-driven flows)
2. /goals/new, which allows creating a new goal task

For now, the goals task is a special flow definition. Later on the flow definition itself will be generated by AI.

Internal designs are here

Driveby:

• H-2712: expose model plan/explanation for actions as part of progress logs (see second demo)
• H-2715: In the browser plugin history log, show where the plugin has responded to a flow's request for a web page content

🔍 What does this change?

• ...

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
• [x] affected the execution graph, and the turbo.json's have been updated to reflect this
• [x] I am unsure / need advice

⚠️ Known issues

• H-2722: The goals should have distinguishing names based on the research prompt somehow

🛡 What tests cover this?

• None yet

❓ How to test this?

1. Check out the new pages

📹 Demo

New pages

https://github.com/hashintel/hash/assets/37743469/556529d3-a16e-4228-b751-0ffd574fb1c3

Progress log tooltips with model plan / explanation of actions

https://github.com/hashintel/hash/assets/37743469/90868ff1-ef9f-4d9b-924c-d38a8f7ca0ef

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 21.15%. Comparing base (7ef056a) to head (e5c5f16). Report is 2050 commits behind head on main.

Files with missing lines	Patch %	Lines
...sh-ai-worker-ts/src/workflows/run-flow-workflow.ts	0.00%	9 Missing :warning:
...l/hash-backend-utils/flows/get-flow-run-details.ts	0.00%	5 Missing :warning:
...vities/flow-activities/research-entities-action.ts	0.00%	3 Missing :warning:
apps/hash-api/src/ai/infer-entities-websocket.ts	0.00%	2 Missing :warning:
...w-activities/infer-entities-from-content-action.ts	0.00%	1 Missing :warning:
...orphic-utils/src/flows/example-flow-definitions.ts	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4485      +/-   ##
==========================================
- Coverage   21.44%   21.15%   -0.30%     
==========================================
  Files         453      456       +3     
  Lines       15007    15215     +208     
  Branches     2221     2273      +52     
==========================================
  Hits         3218     3218              
- Misses      11748    11956     +208     
  Partials       41       41              

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[CiaranMn]

@benwerner01 I fixed the bug in the popup you identified in https://github.com/hashintel/hash/pull/4485/commits/e5c5f16e256299417b7b7ce219f94ec99fc3b3f9, as well as another one where the user was being overfetched, causing settings changes to be overwritten sometimes