load_stac with invalid/unreachable url: job stuck in status "created"

[soxofaan]

(found out while playing with aggregator crossbackend feature Open-EO/openeo-aggregator#115)

using load_stac, with an invalid url (or one where auth fails): job.start fails, but status of job stays created and never reaches status error.

e.g.

import openeo
con = openeo.connect("openeo-dev.vito.be")
con.authenticate_oidc()

cube = con.load_stac("https://example.com/invalid/url")
cube = cube.save_result(format="netCDF")

job = cube.create_job()
print(job.job_id, job.status())
# -> 'j-b60ea2114b804e419b619a4320d11c20', 'created'

job.start()
# ->  OpenEoApiError: [500] Internal: Server error: HTTPError('404 Client Error: Not Found for url: https://example.com/invalid/url') (ref: r-2438fbe2e26c4eb88335ddaf80f344b1)

print(job.status())
# -> created

This breaks situations where you have multiple jobs depending on each other (e.g. crossbackend execution): the "toplevel" batch job will never be able to finish, because it is stuck waiting for a dependency to reach "finished" or "error"