feat: Update the design for integration page (#9825)

Combine integrations and applications page into one page. 

<img width="1182" alt="Screenshot 2024-07-23 at 3 30 51 PM"
src="https://github.com/user-attachments/assets/50920a6f-606f-44b3-b1e4-641046a14444">

Major changes:

- The app enabled?, active? checks are all moved to backend.
- The dashboard_apps integration is also now part of the apps.yml file.
- Updated the header design for the new settings pages.
- Merged the folders integrationapps and integrations. 
- Updated the copy to match the size of the card and provide clear
instruction.
- Only the list page is updated in this PR, rest of the pages are yet to
be migrated.


| Integration | Verified | 
| -- | -- |
| Dashboard Apps | ✅ | 
| Dyte | ✅ | 
| Slack | ✅ | 
| Webhooks | ✅ | 
| Dialogflow | ✅ | 
| Google Translate | ✅ | 
| OpenAI | ✅ | 
| Linear | ✅ |

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/i18n/locale/en/integrations.json

@@ -1,6 +1,9 @@
 {
   "INTEGRATION_SETTINGS": {
     "HEADER": "Integrations",
+    "DESCRIPTION": "Chatwoot integrates with multiple tools and services to improve your team's efficiency. Explore the list below to configure your favorite apps.",
+    "LEARN_MORE": "Learn more about integrations",
+    "LOADING": "Fetching integrations",
     "WEBHOOK": {
       "SUBSCRIBED_EVENTS": "Subscribed Events",
       "FORM": {
@@ -37,7 +40,10 @@
       "LIST": {
         "404": "There are no webhooks configured for this account.",
         "TITLE": "Manage webhooks",
-        "TABLE_HEADER": ["Webhook endpoint", "Actions"]
+        "TABLE_HEADER": [
+          "Webhook endpoint",
+          "Actions"
+        ]
       },
       "EDIT": {
         "BUTTON_TEXT": "Edit",
@@ -169,7 +175,10 @@
       "LIST": {
         "404": "There are no dashboard apps configured on this account yet",
         "LOADING": "Fetching dashboard apps...",
-        "TABLE_HEADER": ["Name", "Endpoint"],
+        "TABLE_HEADER": [
+          "Name",
+          "Endpoint"
+        ],
         "EDIT_TOOLTIP": "Edit app",
         "DELETE_TOOLTIP": "Delete app"
       },

app/javascript/dashboard/i18n/locale/en/sla.json

@@ -1,6 +1,6 @@
 {
   "SLA": {
-    "HEADER": "SLA",
+    "HEADER": "Service Level Agreements",
     "ADD_ACTION": "Add SLA",
     "ADD_ACTION_LONG": "Create a new SLA Policy",
     "DESCRIPTION": "Service Level Agreements (SLAs) are contracts that define clear expectations between your team and customers. They establish standards for response and resolution times, creating a framework for accountability and ensures a consistent, high-quality experience.",
@@ -105,4 +105,4 @@
       "HIDE": "Hide {count} rows"
     }
   }
-}
+}