feat: test runner v2

[darvld]

Summary

This PR reworks our current test runner architecture, decoupling it from polyglot code to allow more flexible test features, such as host-side JVM testing (as opposed to just Espresso-run).

The main principle behind the new implementation is that tests are no longer executable on their own, a TestCase is now used to represent information that can be used by a TestDriver to execute the case instead. This allows JVM tests to be represented as data (e.g. a qualified class name and method name), and then executed in different ways by specific drivers.

Some components from the previous version (like the TestingRegistrar) are kept to ease the transition and will be refactored in the near future to better fit their purpose.

Future work

A few changes were left out of this PR's scope to avoid feature creep:

• Host-side JVM test driver
• JUnit Jupiter test discovery/execution
• Improved output for the elide test command; proper support for parallel tests output

Note: this PR does not fulfill #1580, but it addresses it in part. JUnit support and the tooling events API (coming soon) will fully close the issue.

[codecov]

Codecov Report

❌ Patch coverage is 3.23276% with 449 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.02%. Comparing base (be553b1) to head (cbf2060).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...kotlin/elide/tool/cli/cmd/repl/ToolShellCommand.kt	8.19%	163 Missing and 5 partials ⚠️
...ain/kotlin/elide/tooling/runner/ElideTestRunner.kt	0.00%	70 Missing ⚠️
...in/kotlin/elide/tooling/jvm/JvmTestConfigurator.kt	0.00%	61 Missing ⚠️
...otlin/elide/tooling/testing/jvm/JUnitTestDriver.kt	0.00%	31 Missing ⚠️
...otlin/elide/tooling/testing/MutableTestRegistry.kt	0.00%	19 Missing ⚠️
...in/kotlin/elide/tooling/config/TestConfigurator.kt	0.00%	17 Missing ⚠️
...kotlin/elide/tooling/testing/jvm/JUnitTestSuite.kt	0.00%	12 Missing ⚠️
...in/elide/tooling/testing/jvm/GuestJvmTestDriver.kt	0.00%	11 Missing ⚠️
...rc/main/kotlin/elide/tooling/testing/TestDriver.kt	0.00%	8 Missing ⚠️
...kotlin/elide/tooling/testing/TestDriverRegistry.kt	0.00%	7 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1625      +/-   ##
==========================================
+ Coverage   39.97%   40.02%   +0.04%     
==========================================
  Files         784      790       +6     
  Lines       37459    37414      -45     
  Branches     5300     5313      +13     
==========================================
  Hits        14976    14976              
+ Misses      20691    20647      -44     
+ Partials     1792     1791       -1     

Flag	Coverage Δ
jvm	40.02% <3.23%> (+0.04%)	⬆️
lib	40.02% <3.23%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...rc/main/kotlin/elide/tooling/builder/TestDriver.kt	0.00% <0.00%> (ø)
...main/kotlin/elide/tooling/testing/TestRunResult.kt	0.00% <0.00%> (ø)
...ide/runtime/intrinsics/testing/TestingRegistrar.kt	30.35% <0.00%> (ø)
...n/kotlin/elide/tooling/config/TestConfigurators.kt	0.00% <0.00%> (ø)
.../main/kotlin/elide/tooling/testing/TestRegistry.kt	0.00% <0.00%> (ø)
.../src/main/kotlin/elide/tooling/testing/TestNode.kt	0.00% <0.00%> (ø)
...n/kotlin/elide/tooling/config/TestConfiguration.kt	0.00% <0.00%> (ø)
...in/kotlin/elide/tooling/testing/DynamicTestCase.kt	0.00% <0.00%> (ø)
...c/main/kotlin/elide/tooling/testing/TestOutcome.kt	0.00% <0.00%> (ø)
...kotlin/elide/tooling/testing/TestDriverRegistry.kt	0.00% <0.00%> (ø)
... and 11 more

... and 1 file with indirect coverage changes

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