Speed up realm server tests

[IanCal]

There are a few things slowing down the realm server tests:

• Base realm starting when we don't use it
• Starting too many prerender pages
• Re-indexing the same contents multiple times
• Not reusing the same realm server for read-only operations (before vs beforeEach use)
• Indexing way more than we need

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore base realm server for base module resolution

This suite now only spins up the permissioned test realm, but the fixtures in this file still import https://cardstack.com/base/* (e.g., the place.gts payload below). With setupBaseRealmServer removed, createVirtualNetwork continues to map the base realm to http://localhost:4201/, so CachingDefinitionLookup will probe that URL and fail when resolving those base modules, leading to FilterRefersToNonexistentTypeError/fetch failures during indexing or rendering. Unless base realm modules are shimmed some other way, these tests will now break without a base realm server.

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[github-actions]

Host Test Results

    1 files  ±  0      1 suites  ±0   1h 37m 37s ⏱️ + 4m 18s
1 862 tests +211  1 846 ✅ +212  15 💤 ±0  0 ❌  - 1  1 🔥 ±0 
1 877 runs  +212  1 860 ✅ +213  15 💤 ±0  1 ❌  - 1  1 🔥 ±0 

For more details on these errors, see this check.

Results for commit 9b5ba90. ± Comparison against base commit c0eb977.

This pull request removes 1 and adds 212 tests. Note that renamed tests count towards both.

Chrome ‑ Global error: Uncaught TypeError: Failed to fetch at http://localhost:7357/assets/chunk.960127ff7fdd4dd67122.js, line 153748  While executing test: Integration | card-copy: can copy multiple cards 

Chrome ‑ Acceptance | prerender | file-extract: falls back and marks mismatch when the extractor signals a content mismatch
Chrome ‑ Acceptance | prerender | file-extract: falls back when the FileDef module is missing extractAttributes
Chrome ‑ Acceptance | prerender | file-extract: returns an error when fileExtract is not enabled
Chrome ‑ Acceptance | prerender | file-extract: returns an error when the file fetch fails
Chrome ‑ Acceptance | prerender | file-extract: returns an error when the render model is missing
Chrome ‑ Acceptance | prerender | file-extract: uses the provided FileDef to extract attributes
Chrome ‑ Integration | Store: added instance that was previously not saved will begin to auto save after being added
Chrome ‑ Integration | Store: an instance can be restored after a loader reset
Chrome ‑ Integration | Store: an instance can debounce auto saves
Chrome ‑ Integration | Store: an instance can live update thru an error state
…

♻️ This comment has been updated with latest results.