fix: Fix jest usage with mocks

[ntucker]

Motivation

Jest (and other CommonJS consumers) fail when importing @data-client/test because the /mock subpath exports in @data-client/react and @data-client/core only had ESM builds. When Jest tries to require('@data-client/react/mock'), it resolves to the ESM file which uses export * syntax, causing:

SyntaxError: Unexpected token 'export'

Solution

Add CommonJS builds for the /mock subpath exports in both packages:

1. @data-client/core: Added src/mock/index.ts to rollup CJS build, outputs dist/mock.js
2. @data-client/react: Added src/mock/index.ts to rollup CJS build, outputs dist/mock.js
3. Updated package.json exports in both packages to include "require" condition pointing to the new CJS bundles

Changes

Package	File	Change
@data-client/core	rollup.config.mjs	Added mock entry to CJS build
@data-client/core	package.json	Added require condition to ./mock export
@data-client/react	rollup.config.mjs	Added mock entry to CJS build
@data-client/react	package.json	Added require condition to ./mock export

[changeset-bot]

🦋 Changeset detected

Latest commit: 2713177

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@data-client/core	Patch
@data-client/react	Patch
@data-client/vue	Patch
example-benchmark	Patch
test-bundlesize	Patch
coinbase-lite	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.12%. Comparing base (4296d32) to head (2713177).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3691   +/-   ##
=======================================
  Coverage   98.12%   98.12%           
=======================================
  Files         150      150           
  Lines        2715     2715           
  Branches      536      536           
=======================================
  Hits         2664     2664           
  Misses         11       11           
  Partials       40       40           

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