Allow tag deletion on broken tags

- Remove tag validation in delete API
- Show delete button even when tag is broken

app/assets/javascripts/packages_and_registries/container_registry/explorer/components/details_page/tags_list_row.vue

@@ -107,11 +107,8 @@ export default {
     isInvalidTag() {
       return !this.tag.digest;
     },
-    isCheckboxDisabled() {
-      return this.isInvalidTag || this.disabled;
-    },
     isDeleteDisabled() {
-      return this.isInvalidTag || this.disabled || !this.tag.canDelete;
+      return this.disabled || !this.tag.canDelete;
     },
   },
 };
@@ -122,7 +119,7 @@ export default {
     <template #left-action>
       <gl-form-checkbox
         v-if="tag.canDelete"
-        :disabled="isCheckboxDisabled"
+        :disabled="disabled"
         class="gl-m-0"
         :checked="selected"
         @change="$emit('select')"

lib/api/project_container_repositories.rb

@@ -123,7 +123,6 @@ module API
       end
       delete ':id/registry/repositories/:repository_id/tags/:tag_name', requirements: REPOSITORY_ENDPOINT_REQUIREMENTS do
         authorize_destroy_container_image!
-        validate_tag!
 
         result = ::Projects::ContainerRepository::DeleteTagsService
           .new(repository.project, current_user, tags: [declared_params[:tag_name]])

spec/frontend/packages_and_registries/container_registry/explorer/components/details_page/tags_list_row_spec.js

@@ -75,16 +75,19 @@ describe('tags list row', () => {
     });
 
     it.each`
-      digest   | disabled
-      ${'foo'} | ${true}
-      ${null}  | ${false}
-      ${null}  | ${true}
-      ${'foo'} | ${true}
-    `('is disabled when the digest $digest and disabled is $disabled', ({ digest, disabled }) => {
+      digest   | disabled | isDisabled
+      ${'foo'} | ${true}  | ${'true'}
+      ${null}  | ${true}  | ${'true'}
+      ${null}  | ${false} | ${undefined}
+      ${'foo'} | ${false} | ${undefined}
+    `(
+      'disabled attribute is set to $isDisabled when the digest $digest and disabled is $disabled',
+      ({ digest, disabled, isDisabled }) => {
         mountComponent({ tag: { ...tag, digest }, disabled });
 
-      expect(findCheckbox().attributes('disabled')).toBe('true');
-    });
+        expect(findCheckbox().attributes('disabled')).toBe(isDisabled);
+      },
+    );
 
     it('is wired to the selected prop', () => {
       mountComponent({ ...defaultProps, selected: true });