Step 2 - LEGAL API - Director validation

### Background

This task is to change the validation on required number of directors depending on the entity type
- [ ] A BC Limited Company has a minimum of 1 director
- [ ] A BC Unlimited Liability Company has a minimum of 1 director
- [ ] A BC Community Contribution Company has a minimum of **3 directors**

### Notes
This ticket assumes that the work has been done to create the system to define certain rules depending on the entity type.
This ticket is the Legal API work for 6873 (UI)

### Acceptance Criteria

#### Scenario 1 - LTD
**GIVEN** I am incorporating a BC Limited Company
**WHEN** I am adding directors
**THEN** I will be told i need 1 director minimum
**AND** I will be given an error if I try to proceed without one

#### Scenario 2 - ULC
**GIVEN** I am incorporating a BC Unlimited Company
**WHEN** I am adding directors
**THEN** I will be told i need 1 director minimum
**AND** I will be given an error if I try to proceed without one

#### Scenario 3 - CCC
**GIVEN** I am incorporating a BC Community Contribution Company
**WHEN** I am adding directors
**THEN** I will be told i need 3 directors minimum
**AND** I will be given an error if I try to proceed without 3 directors