Plugin fails frequently due to 'HTTP 429 Too many requests'.

[rodikh]

When making a lot of API calls to /v1/jobs, due to having many departments for example, or due to other plugins having many content updates and re-calling sourceNodes multiple times, the request eventually fails with the following error:

Failed to fetch jobs for department.

Upon further investigation I found out that the axios request inside getJobsForDepartment fails and throws a 429 Too Many Requests error, which in turn leads to process.exit(1) in the catch clause inside sourceNodes, which crashes the entire project.

My suggestion is to add a retry mechanism on failed requests, and add a backoff delay in the case of an HTTP 429 error.