fix: improper implementation of handleBatchMethod + more robust tests

[ecp4224]

Explanation

This PR fixes a bug where the extension provider invokes the metamask_batch request logic correctly, but then also sends a metamask_batch request again. This (at best) causes the requests to be sent individually, then all at once or (at worst) causing metamask_batch to break entirely if the extension doesn't support the RPC

Currently, the latter case happens. The requests are sent individually, but then errors because it then tries to send metamask_batch and the extension doesn't support that

With the fixed logic in handleBatchMethod, the extension and SDK return the correct result

This PR also updates the unit tests for handleBatchMethod to be more robust to ensure this behavior doesn't regress.

Checklist

• I've updated the test suite for new or updated code as appropriate
• [N/A] I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• [N/A] I've highlighted breaking changes using the "BREAKING" category above as appropriate

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.14%. Comparing base (23c2a19) to head (d7dafdd).

Files with missing lines	Patch %	Lines
...ider/extensionProviderHelpers/handleBatchMethod.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1065      +/-   ##
==========================================
- Coverage   78.16%   78.14%   -0.02%     
==========================================
  Files         179      179              
  Lines        4153     4155       +2     
  Branches     1020     1022       +2     
==========================================
+ Hits         3246     3247       +1     
- Misses        907      908       +1     

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[elefantel]

LGTM

[deeeed]

@christopherferreira9 Can you take a look at this PR to make sure everything is good with metamask_batch since we recently had regression?