Move Maintenance Status Descriptions to MeltanoHub

I think we should move these maintenance statuses from MeltanoLabs to MeltanoHub to define what the labels mean in that context. We should split some of the status attributes out of the descriptions to make them more appropriate for each environment. MeltanoLabs can link to the MeltanoHub descriptions and append a few extra attributes ("All maintenance status attributes from MeltanoLabs, plus X other attributes"). We expect MeltanoLabs to have a higher level of quality for example CI pipelines which arent a requirement in MeltanoHub.