fix: Conditionally fetch limits and assistants for enterprise/cloud (#12099)

# Pull Request Template

## Description

### Issue

The Community Edition (CE) dashboard was making API requests to
enterprise-only endpoints, causing 404 errors:

* `/enterprise/api/v1/accounts/1/limits`
* `/api/v1/accounts/1/captain/assistants?page=1`

### Solution

1. Added conditional checks to prevent these calls.
2. Remove unused component
`app/javascript/dashboard/components/app/UpgradeBanner.vue`

Fixes
[CW-4695](https://linear.app/chatwoot/issue/CW-4695/440-ce-dashboard-calls-enterprise-urls),
https://github.com/chatwoot/chatwoot/issues/12023

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/components/copilot/CopilotContainer.vue

@@ -4,6 +4,7 @@ import { useStore } from 'dashboard/composables/store';
 import Copilot from 'dashboard/components-next/copilot/Copilot.vue';
 import { useMapGetter } from 'dashboard/composables/store';
 import { useUISettings } from 'dashboard/composables/useUISettings';
+import { useConfig } from 'dashboard/composables/useConfig';
 import { useWindowSize } from '@vueuse/core';
 import { vOnClickOutside } from '@vueuse/components';
 import { FEATURE_FLAGS } from 'dashboard/featureFlags';
@@ -18,6 +19,7 @@ defineProps({
 
 const store = useStore();
 const { uiSettings, updateUISettings } = useUISettings();
+const { isEnterprise } = useConfig();
 const { width: windowWidth } = useWindowSize();
 
 const currentUser = useMapGetter('getCurrentUser');
@@ -82,6 +84,9 @@ const setAssistant = async assistant => {
 };
 
 const shouldShowCopilotPanel = computed(() => {
+  if (!isEnterprise) {
+    return false;
+  }
   const isCaptainEnabled = isFeatureEnabledonAccount.value(
     currentAccountId.value,
     FEATURE_FLAGS.CAPTAIN
@@ -113,7 +118,9 @@ const sendMessage = async message => {
 };
 
 onMounted(() => {
-  store.dispatch('captainAssistants/get');
+  if (isEnterprise) {
+    store.dispatch('captainAssistants/get');
+  }
 });
 </script>