[7.2.2] OIDC provider setup - Incorrect error message when Issuer URL has a trailing slash

When setting up an OIDC provider, if the the Issuer URL (ex. https://authentik.example.com/application/o/unraid/) has a trailing slash, it shows the error "Must be a valid HTTP or HTTPS URL without trailing slashes or whitespace".
This error does not prevent saving the settings, however depending on the setup (such as my setup using Authentik), a trailing slash is REQUIRED in order for the OIDC to work.

Per the specifications, Issuer URLs must match EXACTLY on both sides, and this error message can cause incorrect configuration leading to unnecessary troubleshooting.
The best resolution would be to remove that error message entirely.