fix(network-group): use text/plain Accept header for WireGuard configuration endpoint

The endpoint returns a WireGuard configuration file as plain text, not JSON.

Author: Pierre DE SOYRES

esm/api/v4/network-group.js

@@ -255,7 +255,7 @@ export function getNetworkGroupWireGuardConfiguration(params) {
   return Promise.resolve({
     method: 'get',
     url: `/v4/networkgroups/organisations/${params.ownerId}/networkgroups/${params.networkGroupId}/peers/${params.peerId}/wireguard/configuration`,
-    headers: { Accept: 'application/json' },
+    headers: { Accept: 'text/plain' },
     // no query params
     // no body
   });

src/clients/cc-api/commands/network-group/get-network-group-wireguard-configuration-command.js

@@ -1,7 +1,7 @@
 /**
  * @import { GetNetworkGroupWireguardConfigurationCommandInput, GetNetworkGroupWireguardConfigurationCommandOutput } from './get-network-group-wireguard-configuration-command.types.js';
  */
-import { get } from '../../../../lib/request/request-params-builder.js';
+import { HeadersBuilder } from '../../../../lib/request/headers-builder.js';
 import { safeUrl } from '../../../../lib/utils.js';
 import { CcApiSimpleCommand } from '../../lib/cc-api-command.js';
 
@@ -15,9 +15,11 @@ import { CcApiSimpleCommand } from '../../lib/cc-api-command.js';
 export class GetNetworkGroupWireguardConfigurationCommand extends CcApiSimpleCommand {
   /** @type {CcApiSimpleCommand<GetNetworkGroupWireguardConfigurationCommandInput, GetNetworkGroupWireguardConfigurationCommandOutput>['toRequestParams']} */
   toRequestParams(params) {
-    return get(
-      safeUrl`/v4/networkgroups/organisations/${params.ownerId}/networkgroups/${params.networkGroupId}/peers/${params.peerId}/wireguard/configuration`,
-    );
+    return {
+      method: 'GET',
+      url: safeUrl`/v4/networkgroups/organisations/${params.ownerId}/networkgroups/${params.networkGroupId}/peers/${params.peerId}/wireguard/configuration`,
+      headers: new HeadersBuilder().acceptTextPlain().build(),
+    };
   }
 
   /** @type {CcApiSimpleCommand<?, ?>['getEmptyResponsePolicy']} */

test/e2e/clients/cc-api/commands/network-group-commands.spec.js

@@ -223,9 +223,7 @@ describe('network-group commands', function () {
       }),
     );
 
-    expect(response.ngId).to.equal(createdNetworkGroup.id);
-    expect(response.peerId).to.equal(externalPeer.id);
-    expect(response.version).to.be.a('number');
+    expect(response).to.be.a('string');
   });
 
   it('should get network group peer wireguard config url', async () => {