Update pull request creation condition with feature flag

Replaced the static check for `_gitHubOptions.UseInventoryWithPullRequest` with an asynchronous feature flag check using `_featureManager.IsEnabledAsync("UseInventoryWithPullRequest")`. This enhancement allows for more dynamic control over the pull request creation process based on feature management settings.

Author: calin-lupas_dsamcaps

src/DevExcelerateApi/Services/DevExIssuesEventProcessorService.cs

@@ -154,7 +154,7 @@ private async Task ValidateIssue(IssuesEvent issuesEvent)
                     }
                     else if ((issuesEvent?.Issue?.Labels?.Any(i => i.Name.IsIssueValidated())).GetValueOrDefault())
                     {
-                        if (_gitHubOptions.UseInventoryWithPullRequest)
+                        if (await _featureManager.IsEnabledAsync("UseInventoryWithPullRequest"))
                         {
                             // IF validated, create a pull request
                             await _teamService.ValidateCreateTeam(issuesEvent!, createPullRequest: true);