fix(preview): exclude bind mounts from preview deployment suffix

Bind mount volumes reference files at the repository's original path and
should not receive the -pr-N suffix. Only named Docker volumes require
the suffix for isolation between preview deployments.

Adds PreviewDeploymentBindMountTest to verify the correct behavior.

Fixes #7802

bootstrap/helpers/parsers.php

@@ -789,9 +789,6 @@ function applicationParser(Application $resource, int $pull_request_id = 0, ?int
                             $mainDirectory = str(base_configuration_dir().'/applications/'.$uuid);
                         }
                         $source = replaceLocalSource($source, $mainDirectory);
-                        if ($isPullRequest) {
-                            $source = addPreviewDeploymentSuffix($source, $pull_request_id);
-                        }
                         LocalFileVolume::updateOrCreate(
                             [
                                 'mount_path' => $target,