Ember 6.10 upgrade

[ef4]

This is extracted out of the vite branch.

[github-actions]

Preview deployments

• Host staging preview
• Host production preview
• Boxel UI staging preview

[github-actions]

Host Test Results

    1 files  ±  0      1 suites  ±0   2h 5m 15s ⏱️ - 7m 47s
1 892 tests  - 164  1 872 ✅  - 169  15 💤 ±0  2 ❌ +2  3 🔥 +3 
1 892 runs   - 179  1 869 ✅  - 187  15 💤 ±0  5 ❌ +5  3 🔥 +3 

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

Results for commit 1406276. ± Comparison against base commit 727eac6.

This pull request removes 167 and adds 3 tests. Note that renamed tests count towards both.

Chrome ‑ Acceptance | code-submode | field playground > multiple realms: can autogenerate new Spec and field instance (no preexisting Spec)
Chrome ‑ Acceptance | code-submode | field playground > multiple realms: can autogenerate new field instance when spec exists but has no examples
Chrome ‑ Acceptance | code-submode | field playground > multiple realms: can create new field instance (has preexisting Spec)
Chrome ‑ Acceptance | code-submode | field playground > single realm: can autogenerate new field instance when spec exists but has no examples
Chrome ‑ Acceptance | code-submode | field playground > single realm: can create new field instance (has preexisting Spec)
Chrome ‑ Acceptance | code-submode | field playground > single realm: can request AI assistant to bulk generate samples
Chrome ‑ Acceptance | code-submode | field playground > single realm: can request AI assistant to fill in sample data
Chrome ‑ Acceptance | code-submode | field playground > single realm: does not persist the wrong card for field
Chrome ‑ Acceptance | code-submode | field playground > single realm: editing compound field instance live updates the preview
Chrome ‑ Acceptance | code-submode | field playground > single realm: has default templates when a format template is not provided
…

Chrome ‑ Global error: Uncaught TypeError: Failed to fetch at http://localhost:7357/assets/chunk.7146cd2aaaa94a380008.js, line 155983  After execution of test: Acceptance | code-submode | field playground > single realm: can create new field instance (has preexisting Spec) 
Chrome ‑ Global error: Uncaught TypeError: Failed to fetch at http://localhost:7357/assets/chunk.7146cd2aaaa94a380008.js, line 155983  While executing test: Acceptance | code-submode | field playground > single realm: can create new field instance (has preexisting Spec) 
Chrome ‑ error

♻️ This comment has been updated with latest results.

[ef4]

Next step here is to pick one of the remaining host test failures and dig into it. Many probably share the same few causes.

I was investigating Integration | ai-assistant-panel | sending: displays retry button for message that failed to send and ran out of time before getting to the bottom of it.