**What**
- Adds the use of price selection strategy to the endpoint `GET /admin/variants`
- Updates medusa-js to reflect this change (expanding the parameters).
**Testing**
- Adds a new integration test validating that returned variants are now of type PricedVariant, with the expected fields: original_price, calculated_price, etc.
**Why**
- Our current RMA flows (in our admin dashboard) relied heavily on simply using `order.tax_rate` to calculate variant prices in the different RMA menus. As taxes in Medusa, have become feature complete this approach had become very naive and has several potential issues. Moving the responsibility for calculating the correct prices guarantees that we always show the correct prices to admins.
* fix: replace ILIKE operator with ILike function where possible
* remove: unused import
* fix: remove alias from test case as it is not needed
* fix: product variant query
* add: integration tests + fallback to original query for all queries searching on the display_id field
* remove: console.log
