Fabric native improvements: Settings pane, Partition Key settings tab, sample data and message contract (#2119)

* Hide entire Accordion of options in Settings Pane

* In PartitionKeyComponent hide "Change partition key" label when read-only.

* Create sample data container with correct pkey

* Add unit tests to PartitionKeyComponent

* Fix format

* fix unit test snapshot

* Add Fabric message to open Settings to given tab id

* Improve syntax on message contract

* Remove "(preview)" in partition key tab title in Settings Tab

src/Explorer/Controls/Settings/SettingsSubComponents/PartitionKeyComponent.tsx

@@ -161,7 +161,7 @@ export const PartitionKeyComponent: React.FC<PartitionKeyComponentProps> = ({
   return (
     <Stack tokens={{ childrenGap: 20 }} styles={{ root: { maxWidth: 600 } }}>
       <Stack tokens={{ childrenGap: 10 }}>
-        <Text styles={textHeadingStyle}>Change {partitionKeyName.toLowerCase()}</Text>
+        {!isReadOnly && <Text styles={textHeadingStyle}>Change {partitionKeyName.toLowerCase()}</Text>}
         <Stack horizontal tokens={{ childrenGap: 20 }}>
           <Stack tokens={{ childrenGap: 5 }}>
             <Text styles={textSubHeadingStyle}>Current {partitionKeyName.toLowerCase()}</Text>