feat: Enforce single team when self-hosted (#1954)

* fix: Enforce single team when self hosting

* test: positive case

* refactor

* fix: Visible error message on login screen for max teams scenario

* Update Notices.js

* lint

server/commands/teamCreator.test.js

@@ -34,6 +34,52 @@ describe("teamCreator", () => {
     expect(isNewTeam).toEqual(true);
   });
 
+  it("should now allow creating multiple teams in installation", async () => {
+    await buildTeam();
+    let error;
+
+    try {
+      await teamCreator({
+        name: "Test team",
+        subdomain: "example",
+        avatarUrl: "http://example.com/logo.png",
+        authenticationProvider: {
+          name: "google",
+          providerId: "example.com",
+        },
+      });
+    } catch (err) {
+      error = err;
+    }
+
+    expect(error).toBeTruthy();
+  });
+
+  it("should return existing team when within allowed domains", async () => {
+    const existing = await buildTeam();
+
+    const result = await teamCreator({
+      name: "Updated name",
+      subdomain: "example",
+      domain: "allowed-domain.com",
+      authenticationProvider: {
+        name: "google",
+        providerId: "allowed-domain.com",
+      },
+    });
+
+    const { team, authenticationProvider, isNewTeam } = result;
+
+    expect(team.id).toEqual(existing.id);
+    expect(team.name).toEqual(existing.name);
+    expect(authenticationProvider.name).toEqual("google");
+    expect(authenticationProvider.providerId).toEqual("allowed-domain.com");
+    expect(isNewTeam).toEqual(false);
+
+    const providers = await team.getAuthenticationProviders();
+    expect(providers.length).toEqual(2);
+  });
+
   it("should return exising team", async () => {
     const authenticationProvider = {
       name: "google",