Prepare/Academies API: Excel exports fail if too many UKPRNs are queried

[saziadfe]

Added POST endpoints to two existing GET endpoints

Ticket: https://dfe-gov-uk.visualstudio.com/Academies-and-Free-Schools-SIP/_workitems/edit/215979

[FrostyApeOne]

@saziadfe
Please follow a consistent pattern for the routes, like

POST /establishments/bulk/ukprns
POST /establishments/bulk/urns

Make sure the name matches too

So it would be like

[HttpPost("establishments/bulk/ukprns", Name = "EstablishmentsByUkprns")]
public IActionResult GetEstablishmentsByUkprns([FromBody] UkprnRequestModel model) { … }

[HttpPost("establishments/bulk/urns", Name = "EstablishmentsByUrns")]
public IActionResult GetEstablishmentsByUrns([FromBody] UrnRequestModel model)   { … }

and the models are

public class UkprnRequestModel
{
    public List<string> Ukprns { get; set; }
}

public class UrnRequestModel
{
    public List<string> Urns { get; set; }
}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
94.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud