Consolidate edge discovery into SchemaDiscoveryBoundary

[kmcginnes]

Description

Consolidates the separate EdgeDiscoveryBoundary component into SchemaDiscoveryBoundary via a requireEdgeConnections prop, simplifying the schema discovery flow.

• Remove EdgeDiscoveryBoundary in favor of requireEdgeConnections prop on SchemaDiscoveryBoundary
• Simplify schema failure tracking: rename edgeConnectionDiscoveryFailed to lastEdgeConnectionSyncFail, remove triedToSync
• Add staleTime: Infinity to schema and edge connection queries for explicit cache control
• Derive edge connection initialData from Jotai store with edge type filtering
• Simplify error handling in schemaSyncQuery and edgeConnectionsQuery

Validation

• Verified schema sync and edge connection discovery work end-to-end
• Confirmed Schema Explorer gates on edge connections via requireEdgeConnections
• Checked that persisted failure flags prevent automatic retries across sessions
• All existing tests updated and passing

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.69%. Comparing base (c5affc5) to head (4074dcc).
⚠️ Report is 66 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1530       +/-   ##
===========================================
+ Coverage   47.81%   64.69%   +16.88%     
===========================================
  Files         382      355       -27     
  Lines        8525     7919      -606     
  Branches     3159     2890      -269     
===========================================
+ Hits         4076     5123     +1047     
+ Misses       3070     2012     -1058     
+ Partials     1379      784      -595     

Flag	Coverage Δ
unittests	64.69% <100.00%> (+16.88%)	⬆️

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