Accessibility Fixes for Several SQL Based Datasource Config Pages (#43982)

* Add label elements for select boxes: MSSQL config

* Add Permission level label

* Add aria-label for password field

* Fixes for Postgres a11y page

* Fix whitespace error

* Swap aria-labelby for "for"

* Prefer "for" over aria-labeledby

public/app/angular/angular_wrappers.ts

@@ -134,6 +134,7 @@ export function registerAngularDirectives() {
     'isConfigured',
     'inputWidth',
     'labelWidth',
+    'aria-label',
     ['onReset', { watchDepth: 'reference', wrapApply: true }],
     ['onChange', { watchDepth: 'reference', wrapApply: true }],
   ]);