Verify OAuth application implementation for Web IDE

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We have an instance-wide OAuth application for the Web IDE, as part of Cells 1.0 Discover for groupide, we need to verify how the Web IDE will work once OAuth applications are standalone resources (#461411 - closed) has been resolved.

See #434976 (comment 1916693070) for context.

Investigation Notes

• The Web IDE will automatically create an OAuth application if it doesn't already see one in the application_settings (relevant LOC).
• If each Cell has it's own application_settings, then we're probably good.
• If separate Cells (and therefore separate domains) all share the same application_settings, we'll run into issues.