Integration Testing Framework: Add retries to Artifacts API call

[ycombinator]

Currently in the integration testing framework, the ArtifactsAPIClient doesn't retry calls to the Artifacts API.
Speaking with @DaveSys911, he suggested we should add retries to this call, somewhere in this function:

elastic-agent/pkg/testing/tools/artifacts_api.go

Lines 306 to 319 in f9310c7

	func (aac ArtifactAPIClient) createAndPerformRequest(ctx context.Context, URL string) (*http.Response, error) {
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, URL, nil)
	if err != nil {
	err = fmt.Errorf("composing request: %w", err)
	return nil, err
	}
	resp, err := aac.c.Do(req)
	if err != nil {
	return nil, fmt.Errorf("executing http request %v: %w", req, err)
	}
	return resp, nil
	}

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)