async getLastJobRunTimestamp(jobName) {
        const jobData = await this.getJobData(jobName);
        return jobData ? jobData.finished_at || jobData.started_at : null;
    }
Retrieves the timestamp of the last job run for the specified job name.
@param {EmailAnalyticsJobName} jobName - The name of the job to retrieve the last run timestamp for.
@returns {Promise<Date|null>} The timestamp of the last job run, or null if no job data is found.