Draft: Move externalServices values.yaml to Umbrella

General MR

Summary

Removes the hardcoded externalServices, to be moved to Umbrella BB in separate MR so that they can be toggled when the appropriate backend packages are enabled with BB.

Related MR to move logic to BB Umbrella here

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

#69 (closed)

Upgrade Notices

N/A

Closes #69 (closed)