🪟 🔧 Add isCorporate to Airbyte.UI.User.Create (#22137)

* 🪟 🔧 Add isCorporate to Airbyte.UI.User.Create

We use this event to track conversions across paid channels such as
Google Ads.
Since we are only interested in corporate signups, we only want to track
a successful conversion in those cases.
Previously, we only added the `isCorporate` flag on `.identify()` but we
need this info also in `.track('Airbyte.UI.User.Create')`

Context: https://docs.google.com/document/d/13JbXLgAEVQmMoCBOPdDzAKpzwvqGclMcGSdA3bQ5KYQ/edit?disco=AAAAofb14Pg

* code style suggestion

airbyte-webapp/src/packages/cloud/services/auth/AuthService.tsx

@@ -62,7 +62,7 @@ interface AuthContextApi {
   loggedOut: boolean;
   providers: string[] | null;
   hasPasswordLogin: () => boolean;
-  hasCorporateEmail: () => boolean;
+  hasCorporateEmail: (email?: string) => boolean;
   login: AuthLogin;
   loginWithOAuth: (provider: OAuthProviders) => Observable<OAuthLoginState>;
   signUpWithEmailLink: (form: { name: string; email: string; password: string; news: boolean }) => Promise<void>;
@@ -116,6 +116,7 @@ export const AuthenticationProvider: React.FC<React.PropsWithChildren<unknown>>
       user_id: firebaseUser.uid,
       name: user.name,
       email: user.email,
+      isCorporate: ctx.hasCorporateEmail(user.email),
       // Which login provider was used, e.g. "password", "google.com", "github.com"
       provider: firebaseUser.providerData[0]?.providerId,
       ...getUtmFromStorage(),
@@ -187,8 +188,8 @@ export const AuthenticationProvider: React.FC<React.PropsWithChildren<unknown>>
       hasPasswordLogin(): boolean {
         return !!state.providers?.includes("password");
       },
-      hasCorporateEmail(): boolean {
-        return !FREE_EMAIL_SERVICE_PROVIDERS.some((provider) => state.currentUser?.email.endsWith(`@${provider}`));
+      hasCorporateEmail(email: string | undefined = state.currentUser?.email): boolean {
+        return !FREE_EMAIL_SERVICE_PROVIDERS.some((provider) => email?.endsWith(`@${provider}`));
       },
       async login(values: { email: string; password: string }): Promise<void> {
         await authService.login(values.email, values.password);