Update tests that use a blank repo with no branch

Tests that push to an empty repo need to specify the branch, otherwise
they'll fail if the local default (e.g., master) is different from
GitLab's default (e.g., main).

qa/qa/resource/project.rb

@@ -25,10 +25,6 @@ module QA
       attribute :template_name
       attribute :import
 
-      attribute :default_branch do
-        api_response[:default_branch] || Runtime::Env.default_branch
-      end
-
       attribute :group do
         Group.fabricate!
       end
@@ -224,6 +220,10 @@ module QA
         parse_body(get(Runtime::API::Request.new(api_client, api_commits_path).url))
       end
 
+      def default_branch
+        reload!.api_response[:default_branch] || Runtime::Env.default_branch
+      end
+
       def import_status
         response = get Runtime::API::Request.new(api_client, "/projects/#{id}/import").url
 

qa/qa/resource/repository/wiki_push.rb

@@ -12,14 +12,11 @@ module QA
           end
         end
 
-        def branch_name
-          @branch_name ||= wiki.project.default_branch
-        end
-
         def initialize
           @file_name = 'Home.md'
           @file_content = 'This line was created using git push'
           @commit_message = 'Updating using git push'
+          @branch_name = 'master'
           @new_branch = false
         end
 

qa/qa/specs/features/browser_ui/3_create/repository/clone_spec.rb

@@ -14,10 +14,12 @@ module QA
         Git::Repository.perform do |repository|
           repository.uri = project.repository_http_location.uri
           repository.use_default_credentials
+          repository.default_branch = project.default_branch
 
           repository.act do
             clone
             configure_identity('GitLab QA', 'root@gitlab.com')
+            checkout(default_branch, new_branch: true)
             commit_file('test.rb', 'class Test; end', 'Add Test class')
             commit_file('README.md', '# Test', 'Add Readme')
             push_changes

qa/qa/specs/features/browser_ui/3_create/repository/protocol_v2_push_http_spec.rb

@@ -26,6 +26,8 @@ module QA
           repository.use_default_credentials
           repository.clone
           repository.configure_identity(username, email)
+          repository.default_branch = project.default_branch
+          repository.checkout(project.default_branch, new_branch: true)
 
           git_protocol_reported = repository.push_with_git_protocol(
             git_protocol,

qa/qa/specs/features/browser_ui/3_create/repository/protocol_v2_push_ssh_spec.rb

@@ -49,6 +49,8 @@ module QA
             repository.use_ssh_key(ssh_key)
             repository.clone
             repository.configure_identity(username, email)
+            repository.default_branch = project.default_branch
+            repository.checkout(project.default_branch, new_branch: true)
 
             git_protocol_reported = repository.push_with_git_protocol(
               git_protocol,