Function prepare_http_step 

pub fn prepare_http_step(
    step: &PipelineStep,
    context: &HashMap<String, StepExecutionResult>,
    specs: Option<&[RuntimeSpec]>,
    env_groups: Option<&[RuntimeEnvGroup]>,
    selected_env_group_slug: Option<&str>,
    attempt: usize,
    max_attempts: usize,
) -> Result<PreparedHttpStep, StepExecutionResult>