perf: Move request inspection outside of the executor

[FrederikBolding]

In the current implementation, every RPC request requires a least 3 messages to be sent to manage outbound request/response tracking. This PR proposes to move that tracking to the client side where we can simply monitor the RPC stream for requests and responses. This should alleviate some pressure on the communication layer for Snaps.

---

Note

Shift outbound request/response tracking to AbstractExecutionService by inspecting the JSON-RPC stream, removing executor-side notifications and updating tests accordingly.

• Controllers (packages/snaps-controllers):
  • Update AbstractExecutionService to detect outbound activity by inspecting rpc stream:
    • Publish ExecutionService:outboundRequest on inbound RPC chunks with an id.
    • Intercept rpcStream.write to publish ExecutionService:outboundResponse when writing responses; ignore metamask_chainChanged.
• Execution Environment (packages/snaps-execution-environments):
  • Remove OutboundRequest/OutboundResponse notifications from BaseSnapExecutor provider wrappers (snap.request, ethereum.request) and simplify teardown handling.
  • Adjust BaseSnapExecutor.test.browser.ts to drop expectations for command-stream outbound notifications where applicable, keeping RPC flow assertions intact.
• Coverage: Minor metric fluctuations in coverage JSON files.

^{Written by Cursor Bugbot for commit 8b9e40f. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.27%. Comparing base (36f2212) to head (8b9e40f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntrollers/src/services/AbstractExecutionService.ts	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3356      +/-   ##
==========================================
- Coverage   98.30%   98.27%   -0.03%     
==========================================
  Files         417      417              
  Lines       11927    11903      -24     
  Branches     1844     1845       +1     
==========================================
- Hits        11725    11698      -27     
- Misses        202      205       +3     

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[FrederikBolding]

This is uncovered, but we don't have an easy way to test this right now