Org billing (#1995)
* Add billing organization selection
Introduces support for selecting a billing organization for inference requests in HuggingChat. Adds a new billing section in application settings, updates user settings and API to store and validate the selected organization, and ensures requests are billed to the chosen organization by sending the X-HF-Bill-To header. Also updates environment and chart files to include the new OpenID scope required for billing.
* Update +page.svelte
* Remove billingOrganization from default settings
* Fix user settings creation and update test for findUser
The test for updateUser now passes a URL to findUser to match the updated function signature. Also, the updateUser function now inserts the full DEFAULT_SETTINGS object when creating default user settings, ensuring billingOrganization is included.
