fix(connector_onboarding): Check if connector exists for the merchant account and add reset tracking id API (#3229)
Files to modify:


**connector_onboarding.rs**
  Add:
    - struct: pub::ResetTrackingIdRequest

**connector_onboarding.rs**
  Add:
    - struct: pub::ResetTrackingIdRequest

**consts.rs**
  Modify existing code

**connector_onboarding.rs**
  Add:
    - struct: pub::ResetTrackingIdRequest

**paypal.rs**
  Modify existing code

**app.rs**
  Modify existing code

**connector_onboarding.rs**
  Add:
    - struct: pub::ResetTrackingIdRequest

**lock_utils.rs**
  Modify existing code

**connector_onboarding.rs**
  Add:
    - struct: pub::ResetTrackingIdRequest

**types.rs**
  Modify existing code