Fix MegaLinter ESLint profile failure when @eslint/json is unavailable

[Copilot]

The Lint selected MegaLinter profile job was failing because ESLint config hard-required @eslint/json, but that package is not guaranteed in MegaLinter’s runtime image. This change makes JSON lint integration optional so non-JSON lint targets continue to run.

• Root-cause correction (ESLint config loading)

  • Updated egolint/.config/lint/javascript/eslint.config.mjs to treat @eslint/json as optional.
  • Added targeted MODULE_NOT_FOUND handling for @eslint/json only; other module resolution errors are still surfaced.

• Conditional JSON rule registration

  • JSON/JSONC/JSON5 config blocks are now added only when @eslint/json resolves.
  • Prevents global config bootstrap failure from an optional plugin.

• Regression coverage

  • Added a policy test in egolint/tests/test_megalinter_policy.py that executes the ESLint config in a temporary Node workspace without @eslint/json and verifies JSON-specific blocks are omitted.

const jsonPlugin = (() => {
  try {
    return require("@eslint/json");
  } catch (error) {
    if (error?.code === "MODULE_NOT_FOUND" &&
        String(error.message).includes("@eslint/json")) {
      return null;
    }
    throw error;
  }
})();

const jsonConfigs = jsonPlugin ? [/* json/jsonc/json5 blocks */] : [];

[szmyty]

@copilot Can this be closed now that the other PR was merged?

[Copilot]

@copilot Can this be closed now that the other PR was merged?

Yes — this can be closed. The fix is already on main from the merged PR (#30), so this branch is superseded.

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