fix: openapi schema errors

[georgantasp]

Description:

Adding validation scripts to package.json revealed oapi errors that are then fixed.

Previous output:

npm run validate-all
...
== management/ad-type.yaml ==
Validating spec (management/ad-type.yaml)
Errors:
       - attribute components.securitySchemes.SecurityScheme name $ref doesn't adhere to regular
         expression ^[a-zA-Z0-9\.\-_]+$
       - attribute components.securitySchemes.$ref is not of type `object`

[error] Spec has 2 errors.
...
== management/distance-targeting.yaml ==
Validating spec (management/distance-targeting.yaml)
Errors:
       - attribute
         paths.'/v1/flight/{flightId}/distance/batch'(post).requestBody.content.'application/json'.schema.Distance
         is unexpected
       - attribute
         paths.'/v1/flight/{flightId}/distance/batch'(post).requestBody.content.'application/json'.schema.Latitude
         is unexpected
       - attribute
         paths.'/v1/flight/{flightId}/distance/batch'(post).requestBody.content.'application/json'.schema.Longitude
         is unexpected

[error] Spec has 3 errors.