Clarify "missing_partition" status

[itaischwartz]

https://cube.dev/docs/reference/rest-api#v1pre-aggregationsjobs does not describe possible status values and their meaning.

What does "missing_partition" status mean?

[igorlukanin]

Hi @itaischwartz 👋

As far as I see, this is one of the possible statuses: an erroneous one, specifically:

cube/packages/cubejs-testing/test/rest-test-suite.ts

Lines 209 to 213 in 8f45afa

	const statuses = [
	'scheduled',
	'processing',
	'missing_partition', // TODO (buntarb): wtf?!!
	'done',

I agree this can be documented in a better way.