Simplify computed system

[ef4]

This PR is working to:

• remove async computeds, because we think we can cover their use case with explicit relationships instead and it will greatly simplify the computed system
• refactor the computed internals to work more like glimmer/tracking, such that arbitrary consumption of tracked fields causes automatic reactivity, no matter how "far apart" via arbitrary JS the producer and consumer are.

[github-actions]

Host Tests Test Results

    1 files  ±    0      1 suites  ±0   7m 40s ⏱️ - 6m 30s
270 tests  - 346  229 ✔️  - 377  6 💤  - 4    1 ❌ +  1  34 🔥 +34 
270 runs   - 346  195 ✔️  - 411  6 💤  - 4  35 ❌ +35  34 🔥 +34 

For more details on these failures and errors, see this check.

Results for commit 2e5dff9. ± Comparison against base commit 12995c4.

This pull request removes 347 and adds 1 tests. Note that renamed tests count towards both.

Chrome 125.0 ‑ Integration | Component | RoomMessage: it does not show an error when last streaming chunk is still within reasonable time limit
Chrome 125.0 ‑ Integration | Component | RoomMessage: it shows an error when AI bot message streaming timeouts
Chrome 125.0 ‑ Integration | card-basics > cards allowed to be edited: catalog entry isField indicates if the catalog entry is a field card
Chrome 125.0 ‑ Integration | card-basics > cards allowed to be edited: catalog entry isField indicates if the catalog entry references a card descended from FieldDef
Chrome 125.0 ‑ Integration | computeds: can indirectly render an asynchronous computed field
Chrome 125.0 ‑ Integration | computeds: can maintain data consistency for async computed fields
Chrome 125.0 ‑ Integration | computeds: can render a async computed that depends on an async computed: consumer field is first
Chrome 125.0 ‑ Integration | computeds: can render a nested asynchronous computed field
Chrome 125.0 ‑ Integration | computeds: can render an asynchronous computed composite field
Chrome 125.0 ‑ Integration | computeds: can render an asynchronous computed field
…

Chrome 125.0 ‑ Global error: Uncaught Error: attempted to set read-only computed field created at http://localhost:7357/assets/chunk.c25b25c4bc5b3fd95551.js, line 561933
 While executing test: Integration | operator-mode > matrix: it maintains status of apply buttons during a session when switching between rooms

♻️ This comment has been updated with latest results.

[github-actions]

Host Test Results

    1 files  ±  0      1 suites  ±0   13m 20s ⏱️ -14s
599 tests  - 38  552 ✔️  -   83  1 💤  - 1    1 ❌ +  1  45 🔥 +45 
603 runs   - 39  511 ✔️  - 129  1 💤  - 1  46 ❌ +46  45 🔥 +45 

For more details on these failures and errors, see this check.

Results for commit 4a0c5c0. ± Comparison against base commit 5716b6e.

This pull request removes 39 and adds 1 tests. Note that renamed tests count towards both.

Chrome 126.0 ‑ Integration | ai-assistant-panel: assures applied state displayed as a check mark even eventId in command payload is undefined
Chrome 126.0 ‑ Integration | ai-assistant-panel: button states only apply to a single button in a chat room
Chrome 126.0 ‑ Integration | ai-assistant-panel: can close past-sessions list on outside click
Chrome 126.0 ‑ Integration | ai-assistant-panel: displays message slightly muted when it is being sent
Chrome 126.0 ‑ Integration | ai-assistant-panel: displays retry button for message that failed to send
Chrome 126.0 ‑ Integration | ai-assistant-panel: it animates the sessions dropdown button when there are other sessions that have activity which was not seen by the user yet
Chrome 126.0 ‑ Integration | ai-assistant-panel: it can apply change to a linksTo field
Chrome 126.0 ‑ Integration | ai-assistant-panel: it can apply change to nested contains field
Chrome 126.0 ‑ Integration | ai-assistant-panel: it can handle an error during room creation
Chrome 126.0 ‑ Integration | ai-assistant-panel: it can handle an error in a card attached to a matrix message
…

Chrome 126.0 ‑ Global error: Uncaught Error: attempted to set read-only computed field created at http://localhost:7357/assets/chunk.ef0eb5edd6e7f294e317.js, line 564400  While executing test: Integration | ai-assistant-panel: it maintains status of apply buttons during a session when switching between rooms