[extension/receiver/exporter/connector/processor] Move `MakeFactoryMap` to `otelcol`

[mx-psi]

The MakeFactoryMap functions are (i) redundant after the introduction of generics and (ii) a concept only useful if you have an otelcol. We should move them to otelcol.

From the 2025-01-27 Collector stability working group meeting.