Add diseases count per phenotype in the instant search tool of Diagnosis section

Similarly to improvements made in Gene panels section PT-3606, we can add disease count per phenotype and sort phenotypes displayed by the count in DESC order. Free text phenotypes should follow the sign and be displayed at the end.

***QUESTION: Maybe we can redo the whole section so it looks like Gene Panels ( grid, pagination, phenotypes related to the decease listed on the right)?
Probably no because of PT-2783.***