fix: use global id for user sync filtering

[asajjad2]

What are the relevant tickets?

#8421

Description (What does it do?)

This PR updates our bulk HubSpot contact sync to reflect our SCIM-based provisioning. Historically we filtered bulk “create --users” by requiring a social_auth record, which made sense when most real users logged in interactively. Since SCIM now provisions many legitimate users without social_auth, those users were excluded from bulk syncs and not synced to hubspot.

We now select users with is_active=True, a valid email, and global_id present, replacing the social_auth check. This aligns bulk backfills with registration and --ids flows and ensures SCIM-provisioned users are included.

How can this be tested?

1. Run python manage.py sync_db_to_hubspot create --users and verify:
   • New contacts are created for active users with valid emails and global_id (no social auth object needed).
   • hubspot_sync_datetime is set on success.