Switch headless tests to radler

[LeFrosch]

Since classic is going to be unbundled with 262 the dependency on classic has to be removed and headless tests need to run with radler. Furthermore, this allows us to finally write gutter icon tests down the line.

[gemini-code-assist]

Code Review

This pull request updates Bazel module dependencies, adds test-framework-team-city.jar to the CLion 261 SDK, and switches the suppressed plugin set from classic to radler in CLion test definitions. It also refactors ClwbHeadlessTestCase to resolve and symlink both bin and lib sandbox directories prior to application startup. Feedback on these changes highlights a critical issue in linkSandboxDir where local test execution could lead to the accidental deletion of SDK files if the symlink and target paths are identical; adding a path equality check is recommended to prevent this.

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[gemini-code-assist]

If link and target point to the same path (for example, when running tests locally where idea.home.path points directly to the SDK), calling Files.deleteIfExists(link) will attempt to delete the actual SDK directory, which will fail or delete SDK files. We should add a guard to return early if link and target are the same path.

  private static void linkSandboxDir(Path sdkRoot, String dirName, Path link) {
    final var target = sdkRoot.resolve(dirName);
    assertExists(target.toFile());

    if (link.toAbsolutePath().equals(target.toAbsolutePath())) {
      return;
    }

    try {
      Files.deleteIfExists(link);
      Files.createSymbolicLink(link, target);
    } catch (IOException e) {
      abort("could not create " + dirName + " path symlink", e);
    }
  }