Blueprints: Add test ids

This updates the data-testid of Create button in the header (`Link` component, not OUIA-compliant) and adds a data-testid to the blueprint search input (`SearchInput` component, also not OUIA-compliant).

A testId was also added to the blueprint actions dropdown (`MenuToggle`).

src/Components/sharedComponents/ImageBuilderHeader.tsx

@@ -99,7 +99,7 @@ export const ImageBuilderHeader = ({
                 <Link
                   to={resolveRelPath('imagewizard')}
                   className="pf-c-button pf-m-tertiary"
-                  data-testid="create-image-action"
+                  data-testid="blueprints-create-button"
                 >
                   Create
                 </Link>