Allow customer-only Google Workspace config

[watchingdogs]

🎟️ Tracking

ID: PM-40799
Link: https://bitwarden.atlassian.net/browse/PM-40799
Issue: #1193

📔 Objective

Allow a Google Workspace configuration with only Customer ID set, currently rejected as "Directory configuration incomplete", which leaves multi-domain accounts unable to sync all of their domains (see the linked issue for details).

• Validation now requires at least one of domain / customer.
• Exactly one query parameter is sent per request; domain keeps precedence when both are configured, so existing configurations keep their current sync scope, the change is purely additive.
• A whitespace-only domain no longer results in a parameterless request (previously surfaced as an obscure Directory API error).

Unit tests added for the validation and parameter selection. Verified against a live multi-domain tenant (8 users, 2 groups, one secondary domain):

Config	Before	After
customer only	rejected	8 users, 2 groups
domain + customer	7 / 1	7 / 1 (unchanged)
domain only	7 / 1	7 / 1 (unchanged)

[CLAassistant]

All committers have signed the CLA.

[bitwarden-bot]

Thank you for your contribution! We've added this to our internal tracking system for review.
ID: PM-40802
Link: https://bitwarden.atlassian.net/browse/PM-40802

Details on our contribution process can be found here: https://contributing.bitwarden.com/contributing/pull-requests/community-pr-process.

[eliykat]

Thanks for your PR @watchingdogs . Your issue write-up and proposed solution make sense to me, but I'm just double checking internally as I'm less familiar with the Google API specifically.