SWATCH-1969: Generate an export service client from the openapi spec

[Sgitario]

Jira issue: SWATCH-1969

Description

In order for swatch to communicate with the export-service, we want to use their openapi spec to generate swatch client code - like we do with other external services (subscription, entitlement gateway, product service, etc.)

Spec: https://raw.githubusercontent.com/RedHatInsights/export-service-go/main/static/spec/private.yaml

In addition to the client, I also added a stub version of the client.

Testing

Added integration tests with Wiremock to ensure the communication is working fine. Further testing must be done when using the client in our export service.

Test with export service locally:
1.- Clone the repository:

git clone https://github.com/RedHatInsights/export-service-go

2.- Start the export service:

cd export-service-go
make run

3.- Create a dummy export request:

make sample-request-create-export

4.- Copy this file to clients/export-client/src/test/resources.

5.- Add the following test case in ExportApiClientFactoryTest:

@Test
  void testDownloadExportUploadLocally() throws Exception {
    config.setUrl("http://localhost:10010");
    // values taken from https://github.com/RedHatInsights/export-service-go/blob/48077b1a04e025f2282f924d98846c7bafc8796d/Makefile#L81
    config.setPsk("testing-a-psk");
    ExportApiClientFactory factory = new ExportApiClientFactory(config);
    ExportApi client = factory.getObject();
    String body = new String(ExportApiClientFactoryTest.class
            .getResourceAsStream("/example_export_upload.json").readAllBytes());
    // values taken from new export CURL step
    UUID exportId = UUID.fromString(<Use EXPORT_ID value from step 3>);
    String applicationName = "exampleApplication";
    UUID resource = UUID.fromString(<Use RESOURCE value from step 3>);
    client.downloadExportUpload(exportId, applicationName, resource, body);
  }

6.- Run the test and you should see the following trace in the export service (from step 2):

2024-01-09T08:53:09.4844Z	info	logger/logger.go:94		{"protocol": "HTTP/1.1", "request": "POST", "path": "/app/export/v1/0ff33f9c-f0ce-4771-8781-8e02886fe931/exampleApplication/fd96af36-f5d2-464a-ab21-1a0114c445cc/upload", "latency": 0.026452057, "status": 202, "size": 17, "request_id": "localhost.localdomain/OJNk12J9HU-000004"}

[lindseyburnett]

Used different test steps because I wanted to test with EE and because my IDE was having classloader issues with the example json. Used a slightly different unit test though that the export-service is getting hit and is responding because I'm expecting a 404 error response (since I didn't initiate an export request from the export service first)

1. Deploy with bonfire

2. Port forward the export-service pod
   oc port-forward Service/export-service-service 8000

3. Apply unit test patch and verify export-service in EE pod responded.

patch: swatch-1969-unit-test.txt

git apply swatch-1969-unit-test.txt

./gradlew :clients:export-client:test --tests '*.testDownloadExportUploadLocally'