bug #808 [Autocomplete] Removing excess deprecation warning (weaverryan)

This PR was squashed before being merged into the 2.x branch.

Discussion
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[Autocomplete] Removing excess deprecation warning

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tickets       | None
| License       | MIT

See: https://github.com/symfony/ux/pull/797/files#r1170531531

Commits
-------

e250a68 [Autocomplete] Removing excess deprecation warning

Author: weaverryan

src/Autocomplete/src/AutocompleteResultsExecutor.php

@@ -71,9 +71,7 @@ public function fetchResults(EntityAutocompleterInterface $autocompleter, string
 
         $results = [];
 
-        if (!method_exists($autocompleter, 'getGroupBy')) {
-            trigger_deprecation('symfony/ux-autocomplete', '2.8', 'Not implementing the "EntityAutocompleterInterface::getGroupBy()" in "%s" is deprecated.', get_debug_type($autocompleter));
-        } elseif (null === $groupBy = $autocompleter->getGroupBy()) {
+        if (!method_exists($autocompleter, 'getGroupBy') || null === $groupBy = $autocompleter->getGroupBy()) {
             foreach ($paginator as $entity) {
                 $results[] = [
                     'value' => $autocompleter->getValue($entity),