Function runOvernightPushPrep

Post-tick step that stages prepared branches under prep/* on the user's fork (#1698).

runOvernightPushPrep(
options: OvernightPushPrepOptions,
): Promise<OvernightPushPrepOutput>
Push every prepared branch of the latest overnight run to prep/* on the user's fork.
Parameters
- options: OvernightPushPrepOptions
Returns Promise<OvernightPushPrepOutput>
- Defined in commands/overnight-push-prep.ts:254