Fix errors due to icon to codicon rename in VSCode (#7837)

Found numerous errors where icons weren't rendering correctly.
- Anything that's an action must have CSS using "codicon" not "icon"
since VSCode sets the "codicon" class automatically.
This affected Agent view in particular, but also:
  - acounts view
  - new tab view in dashboard
 - many more
- Anything referencing the common-icons.css icons needed updating.
This hid help tooltip text in FormContainer UI for example.
- Finally I tried to convert all references from icon -> codicon,
even when the CSS was technically correct. This was done
for maintainability reasons - from now on always add codicon.

Fixes #7827

src/sql/platform/jobManagement/browser/jobManagementUtilities.ts

@@ -7,8 +7,8 @@ import * as nls from 'vs/nls';
 
 export class JobManagementUtilities {
 
-	public static startIconClass: string = 'action-label icon runJobIcon';
-	public static stopIconClass: string = 'action-label icon stopJobIcon';
+	public static startIconClass: string = 'action-label codicon runJobIcon';
+	public static stopIconClass: string = 'action-label codicon stopJobIcon';
 	public static jobMessageLength: number = 110;
 
 	public static convertToStatusString(status: number): string {
@@ -146,4 +146,4 @@ export class JobManagementUtilities {
 		}
 		return '';
 	}
-}
+}