Updated cost messaging for new db/container pane (#333)

* Adds information text further explaining estimated cost.

* Minor tweak to cost messaging

* Updated unit tests

* Added text and link for capacity planner when choosing manual RUs

src/Explorer/Controls/ThroughputInput/ThroughputInputComponentAutoscaleV3.html

@@ -126,6 +126,12 @@
   </div>
 
   <div data-bind="visible: !isAutoPilotSelected()">
+    <p>
+      <span
+        >Estimate your required throughput with
+        <a target="_blank" href="https://cosmos.azure.com/capacitycalculator/">capacity calculator</a></span
+      >
+    </p>
     <div data-bind="setTemplateReady: true">
       <input
         data-bind="