Adds tests for VectorComponentMainMenu in Vector skin.
The test suite includes the following validations:
- Constructor initialization with expected parameters and behaviors.
- Correct identification of 'is-pinned' state
- Inclusion of data for first portlet and rest portlets
- Handling of pin/unpin actions and language alert considerations
- Proper integration of menu elements based on user and feature flags
Change-Id: Ie408ff668893d1de2cf9dd1211a9c82c0b882f99
