Support setting persistent command timeout per task basis (#42847)

* Support setting persistent command timeout per task basis

Fixes #42200

*  Add variable `ansible_command_timeout` to `persistent_command_timeout`
   option for `network_cli` and `netconf` connection plugin so that the
   command_timeout can be set per task basis while using `connection=network_cli`
   or `connection=netconf`
   eg:
   ```
   - name: run copy command
     ios_command:
       commands:
       - show version
     vars:
      ansible_command_timeout: 40
   ```

* Modify `ansible-connection` to read command_timeout value from
  connection plugin options.

* Add `ansible_command_timeout` to `persistent_command_timeout`
  option in `persistent` to support `connection=local` so that
  it is backward compatibilty

* To support `connection=local` pass the timeout value as variables
  from persistent connection to `ansible-connection` instead of sending
  it in playcontext

* Fix CI failure

* Fix review comment

lib/ansible/plugins/connection/network_cli.py

@@ -155,6 +155,8 @@ options:
         key: command_timeout
     env:
       - name: ANSIBLE_PERSISTENT_COMMAND_TIMEOUT
+    vars:
+      - name: ansible_command_timeout
 """
 
 import getpass