fix: Update header button variant based on the active route (#4207) (#4214)

- Added logic to change button variant to "primary" or "secondary"
  based on the current pathname, including the "/flows" route.

Co-authored-by: Mike Fortman <michael.fortman@datastax.com>

src/frontend/src/components/headerComponent/index.tsx

@@ -100,6 +100,7 @@ export default function Header(): JSX.Element {
             className="gap-2"
             variant={
               location.pathname.includes("/all") ||
+              location.pathname.includes("/flows") ||
               location.pathname.includes("/components")
                 ? "primary"
                 : "secondary"