feat: Configurable api server timeout on embedded nginx (#24471)

## Description
- The default request timeout on nginx is set to 60s. This feat allows
users to configure custom nginx timeout value specified via the
Environment variable `APPSMITH_SERVER_TIMEOUT`
- Solves https://github.com/appsmithorg/appsmith/issues/14535
## Testing
#### How Has This Been Tested?
- [x] Manual
- [ ] Jest
- [ ] Cypress

---------

Co-authored-by: Shrikant Sharat Kandula <shrikant@appsmith.com>

deploy/docker/templates/nginx/nginx-app-http.conf.template.sh

@@ -85,6 +85,8 @@ server {
   }
 
   location /api {
+    proxy_read_timeout ${APPSMITH_SERVER_TIMEOUT:-60};
+    proxy_send_timeout ${APPSMITH_SERVER_TIMEOUT:-60};
     proxy_pass http://localhost:8080;
   }
 

deploy/docker/templates/nginx/nginx-app-https.conf.template.sh

@@ -102,6 +102,8 @@ server {
   }
 
   location /api {
+    proxy_read_timeout ${APPSMITH_SERVER_TIMEOUT:-60};
+    proxy_send_timeout ${APPSMITH_SERVER_TIMEOUT:-60};
     proxy_pass http://localhost:8080;
   }