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 ~"group::ide", 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.