Repository endpoint tags pagination (#3238)

* endpoint/api/repository: limit the number of tags returned

- Limit the number of tags returned by /api/v1/repository/<ns:repo> to 500.
- Uses the tag history endpoint instead, with an active tag filte.
- Update UI to use tag history endpoint instead.

static/js/directives/repo-view/repo-panel-tags.js

@@ -237,13 +237,13 @@ angular.module('quay').directive('repoPanelTags', function () {
         }));
       }, true);
 
-      $scope.$watch('repository', function(repository) {
-        if (!repository) { return; }
+      $scope.$watch('repository', function(updatedRepoObject, previousRepoObject) {
+        if (updatedRepoObject.tags === previousRepoObject.tags) { return; }
 
         // Process each of the tags.
         setTagState();
         loadRepoSignatures();
-      });
+      }, true);
 
       $scope.loadImageVulnerabilities = function(image_id, imageData) {
         VulnerabilityService.loadImageVulnerabilities($scope.repository, image_id, function(resp) {

static/js/directives/ui/tag-operations-dialog.js

@@ -46,7 +46,7 @@ angular.module('quay').directive('tagOperationsDialog', function () {
       };
 
       $scope.isAnotherImageTag = function(image, tag) {
-        if (!$scope.repository) { return; }
+        if (!$scope.repository.tags) { return; }
 
         var found = $scope.repository.tags[tag];
         if (found == null) { return false; }
@@ -54,7 +54,7 @@ angular.module('quay').directive('tagOperationsDialog', function () {
       };
 
       $scope.isOwnedTag = function(image, tag) {
-        if (!$scope.repository) { return; }
+        if (!$scope.repository.tags) { return; }
 
         var found = $scope.repository.tags[tag];
         if (found == null) { return false; }