feat(API): Implement users account quota guards (#6434)

* feat(cli): Implement users account quota guards

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Remove comment

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Address PR comments

- Getting `usersQuota` from `Settings` repo
- Revert `isUserManagementEnabled` helper
- Fix FE listing of users

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Refactor isWithinUserQuota getter and fix tests

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Revert testDb.ts changes

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Cleanup & improve types

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Fix duplicated method

* Fix failing test

* Remove `isUserManagementEnabled` completely

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Check for globalRole.name to determine if user is owner

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Fix unit tests

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Set isInstanceOwnerSetUp in specs

* Fix SettingsUserView UM

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* refactor: License typings suggestions for users quota guards (#6636)

refactor: License typings suggestions

* Update packages/cli/src/Ldap/helpers.ts

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

* Update packages/cli/test/integration/shared/utils.ts

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

* Address PR comments

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

* Use 403 for all user quota related errors

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

---------

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Iván Ovejero <ivov.src@gmail.com>

packages/editor-ui/src/stores/settings.store.ts

@@ -37,6 +37,7 @@ export const useSettingsStore = defineStore(STORES.SETTINGS, {
 		settings: {} as IN8nUISettings,
 		promptsData: {} as IN8nPrompts,
 		userManagement: {
+			quota: -1,
 			showSetupOnFirstLoad: false,
 			smtpSetup: false,
 			authenticationMethod: UserManagementAuthenticationMethod.Email,
@@ -169,6 +170,12 @@ export const useSettingsStore = defineStore(STORES.SETTINGS, {
 		isDefaultAuthenticationSaml(): boolean {
 			return this.userManagement.authenticationMethod === UserManagementAuthenticationMethod.Saml;
 		},
+		isBelowUserQuota(): boolean {
+			const userStore = useUsersStore();
+			return (
+				this.userManagement.quota === -1 || this.userManagement.quota > userStore.allUsers.length
+			);
+		},
 	},
 	actions: {
 		setSettings(settings: IN8nUISettings): void {