Clarify whether we recommend to have a CI environment separate from prod

[b-per]

Contributions

• I have read the contribution docs, and understand what's expected of me.

Link to the page on docs.getdbt.com requiring updates

https://docs.getdbt.com/docs/deploy/ci-jobs
https://docs.getdbt.com/guides/set-up-ci?step=2
(other ones?)

What part(s) of the page would you like to see updated?

I thought that we had to create CI environments different from the Prod one in order not to get Metadata/Discovery not loading metadata from those runs but this thread with @jtcohen6 mentions that it is not required for jobs defined as CI ones.

We should clarify:

1. whether we recommend a different CI environment or not
2. and that there is some special logic happening with the CI jobs that make them not being ingested by the Metadata/Discovery process

Additional information

No response