fix(tests): use inline type exports to fix Windows ESM compatibility
Consolidate separate 'export type' and 'export' re-exports into single
export block with inline 'type' keyword. This ensures proper ESM module
resolution on Windows where Node.js strictly validates named exports.
Reverts the workaround of splitting imports in OCPP20TestUtils.ts since
the root cause (improper re-export pattern) is now fixed at source.