feat(FN-3163): remove local ssl workaround (#1188)

## Introduction ✏️
On local builds, the Salesforce domains needed to create a customer are
not whitelisted on the UKEF VPN, so rejectUnauthorized must be set as
false. This doesn't affect higher environments.

## Resolution ✔️
Remove this setting so local builds will fail, but will replicate the
code running on higher environments more closely.

## Miscellaneous ➕
Remove the same commented-out behaviour from Informatica, this domain IS
whitelisted so works on local builds regardless.

Co-authored-by: Nat Dean-Lewis <ndlewis@ukexportfinance.gov.uk>

src/modules/informatica/informatica.module.ts

@@ -20,18 +20,6 @@ import { InformaticaService } from './informatica.service';
             username,
             password,
           },
-          // TODO: APIM-471 - cleanup rejectUnauthorized when Informatica SSL issue is resolved
-          // "rejectUnauthorized: false" is just for local DEV laptop environment, not for DEV/PROD.
-          // to ignore https issues, enable agent and rejectUnauthorized:false below.
-          // import https from 'https';
-          // import crypto from 'crypto';
-          // httpsAgent: new https.Agent({
-          //   // Allow self signed negotiations
-          //   rejectUnauthorized: false,
-
-          //   // Allow legacy server
-          //   secureOptions: crypto.constants.SSL_OP_LEGACY_SERVER_CONNECT,
-          // }),
         };
       },
     }),

src/modules/salesforce/salesforce.module.ts

@@ -1,9 +1,7 @@
 import { Module } from '@nestjs/common';
 import { ConfigModule, ConfigService } from '@nestjs/config';
 import { KEY as SALESFORCE_CONFIG_KEY, SalesforceConfig } from '@ukef/config/salesforce.config';
-import { isDevelopment } from '@ukef/helpers/is-development.helper';
 import { HttpModule } from '@ukef/modules/http/http.module';
-import https from 'https';
 
 import { SalesforceService } from './salesforce.service';
 
@@ -24,13 +22,6 @@ import { SalesforceService } from './salesforce.service';
           accessURL: accessUrl,
           maxRedirects,
           timeout,
-          // TODO: cleanup rejectUnauthorized when Salesforce SSL issue is resolved
-          // "rejectUnauthorized: false" is just for local DEV laptop environment, not for DEV/PROD.
-          // There's a helpdesk ticket pending to whitelist this domain
-          httpsAgent: new https.Agent({
-            // Allow self signed negotiations
-            rejectUnauthorized: !isDevelopment(),
-          }),
         };
       },
     }),