Update subheading of the Orders landing page Search results pane

Purpose: Change the subheading of the Search results pane (second pane) on the Orders landing page when first opened or when search is "reset all", so that the message ("0 results found") is less confusing and matches other app landing pages, e.g. Users

User story statement(s):
As a staff member working with orders
I want the Orders landing page to display a better subheader in the Search results pane
so that it is not confusing

Scenarios:

1. Scenario 1
   • Given the Orders app landing page
   • When a User first opens the app, without performing any search or filter
   • Then change the subheader of the empty Search results pane from "0 results found" to "Enter search criteria to start search"
2. Scenario 2
   • Given the Orders app landing page
   • When a User does a search or filter and receives search results (with a count as the subheader of the search results pane)
   • And then presses "Reset all" in the Search/filter pane
   • Then change the subheader of the empty Search results pane from "[n] results found" to "Enter search criteria to start search"

See attached screenshots: Orders subheader should match the Users landing page Search results subheader