doc: consolidate Collaborator status in GOVERNANCE

Consolidate Collaborator status material in GOVERNANCE.md.

PR-URL: https://github.com/nodejs/node/pull/27128


Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>