auth: add new optional OIDCDisableUserInfo setting for OIDC auth provider (#19566)

Add new optional `OIDCDisableUserInfo` setting for OIDC auth provider which
disables a request to the identity provider to get OIDC UserInfo.

This option is helpful when your identity provider doesn't send any additional
claims from the UserInfo endpoint, such as Microsoft AD FS OIDC Provider:

> The AD FS UserInfo endpoint always returns the subject claim as specified in the
> OpenID standards. AD FS doesn't support additional claims requested via the
> UserInfo endpoint

Fixes #19318

website/content/api-docs/acl/auth-methods.mdx

@@ -63,6 +63,11 @@ The table below shows this endpoint's support for
   - `OIDCClientSecret` `(string: <required>)` - The OAuth client secret
     configured with your OIDC provider.
 
+  - `OIDCDisableUserInfo` `(bool: false)` - When set to `true`, Nomad will not make 
+    a request to the identity provider to get OIDC UserInfo. You may wish to set this
+    if your identity provider doesn't send any additional claims from the UserInfo
+    endpoint.
+
   - `OIDCScopes` `(array<string>)` - List of OIDC scopes.
 
   - `BoundAudiences` `(array<string>)` - List of aud claims that are valid for
@@ -228,6 +233,11 @@ queries](/nomad/api-docs#blocking-queries) and [required ACLs](/nomad/api-docs#a
   - `OIDCClientSecret` `(string: "")` - The OAuth client secret
     configured with your OIDC provider.
 
+  - `OIDCDisableUserInfo` `(bool: false)` - When set to `true`, Nomad will not make 
+    a request to the identity provider to get OIDC UserInfo. You may wish to set this
+    if your identity provider doesn't send any additional claims from the UserInfo
+    endpoint.
+
   - `OIDCScopes` `(array<string>)` - List of OIDC scopes.
 
   - `BoundAudiences` `(array<string>)` - List of aud claims that are valid for