dev: Move example tests to separate script and exclude from unit tests

[Copilot]

This PR addresses the issue where example tests were running as part of unit tests and fixes a validation bug where test failures were being silently ignored.

Changes Made

Fixed validation bug in test utilities

The extractShaderCodes function in testUtils.ts was only logging a warning when expectedCalls didn't match the actual number of shader module creation calls, causing tests to pass when they should fail. This has been changed to throw an error instead:

// Before: Silent failure
if (expectedCalls !== undefined && calls.length !== expectedCalls) {
  console.warn(`Expected ${expectedCalls} shader calls, but got ${calls.length}.`);
}

// After: Proper test failure
if (expectedCalls !== undefined && calls.length !== expectedCalls) {
  throw new Error(`Expected ${expectedCalls} shader calls, but got ${calls.length}.`);
}

Separated example tests from unit tests

Created a separate test configuration for example tests similar to how browser tests are handled:

• Added vitest.examples.config.mts in packages/typegpu specifically for example tests
• Modified packages/typegpu/vitest.config.mts to exclude **/tests/examples/** from unit test runs
• Added test scripts test:examples and test:examples:watch to run example tests separately
• Updated main test script to include example tests alongside unit tests

Results

• Unit tests: Now run 137 test files with 1,295 tests (down from 177 files with 1,335 tests)
• Example tests: Run separately as 40 test files with 40 tests
• Main test suite: Continues to run both via pnpm run test
• CI compatibility: No changes needed to existing workflows

This provides clean separation while ensuring example tests remain part of the testing pipeline, and fixes the silent test failure issue that was masking potential problems.

Original prompt

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This section details on the original issue you should resolve

<issue_title>dev: Move example tests to typegpu-docs and exclude them when running unit tests</issue_title>
<issue_description>We could handle them in a similar way to how we do with browser tests (separate script that is included in the main test one). </issue_description>

Comments on the Issue (you are @copilot in this section)

@aleksanderkatan When the expectedCalls value doesn't match, an error is logged but the test still passes

Fixes #1638

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