Update tests for templates to support default branch

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/331906

ee/spec/lib/gitlab/ci/templates/dast_gitlab_ci_yaml_spec.rb

@@ -6,7 +6,7 @@ RSpec.describe 'DAST.gitlab-ci.yml' do
   subject(:template) { Gitlab::Template::GitlabCiYmlTemplate.find('DAST') }
 
   describe 'the created pipeline' do
-    let(:default_branch) { 'master' }
+    let(:default_branch) { project.default_branch_or_main }
     let(:pipeline_branch) { default_branch }
     let(:project) { create(:project, :custom_repo, files: { 'README.txt' => '' }) }
     let(:user) { project.owner }
@@ -107,7 +107,7 @@ RSpec.describe 'DAST.gitlab-ci.yml' do
             let(:pipeline_branch) { 'patch-1' }
 
             before do
-              project.repository.create_branch(pipeline_branch)
+              project.repository.create_branch(pipeline_branch, default_branch)
             end
 
             it 'includes dast job' do
@@ -133,7 +133,7 @@ RSpec.describe 'DAST.gitlab-ci.yml' do
             let(:pipeline_branch) { 'patch-1' }
 
             before do
-              project.repository.create_branch(pipeline_branch)
+              project.repository.create_branch(pipeline_branch, default_branch)
             end
 
             it 'includes no jobs' do

ee/spec/lib/gitlab/ci/templates/dast_latest_gitlab_ci_yaml_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe 'DAST.latest.gitlab-ci.yml' do
   subject(:template) { Gitlab::Template::GitlabCiYmlTemplate.find('DAST.latest') }
 
   describe 'the created pipeline' do
-    let(:default_branch) { 'master' }
+    let(:default_branch) { project.default_branch_or_main }
     let(:pipeline_branch) { default_branch }
     let(:project) { create(:project, :custom_repo, files: { 'README.txt' => '' }) }
     let(:user) { project.owner }
@@ -143,7 +143,7 @@ RSpec.describe 'DAST.latest.gitlab-ci.yml' do
                 let(:pipeline_branch) { 'patch-1' }
 
                 before do
-                  project.repository.create_branch(pipeline_branch)
+                  project.repository.create_branch(pipeline_branch, default_branch)
                 end
 
                 it 'includes dast job' do
@@ -167,7 +167,7 @@ RSpec.describe 'DAST.latest.gitlab-ci.yml' do
                 let(:pipeline_branch) { 'patch-1' }
 
                 before do
-                  project.repository.create_branch(pipeline_branch)
+                  project.repository.create_branch(pipeline_branch, default_branch)
                 end
 
                 include_examples 'includes no jobs'

spec/lib/gitlab/ci/templates/AWS/deploy_ecs_gitlab_ci_yaml_spec.rb

@@ -6,7 +6,7 @@ RSpec.describe 'Deploy-ECS.gitlab-ci.yml' do
   subject(:template) { Gitlab::Template::GitlabCiYmlTemplate.find('AWS/Deploy-ECS') }
 
   describe 'the created pipeline' do
-    let(:default_branch) { 'master' }
+    let(:default_branch) { project.default_branch_or_main }
     let(:pipeline_branch) { default_branch }
     let(:project) { create(:project, :auto_devops, :custom_repo, files: { 'README.md' => '' }) }
     let(:user) { project.owner }
@@ -38,7 +38,7 @@ RSpec.describe 'Deploy-ECS.gitlab-ci.yml' do
       let(:pipeline_branch) { 'test_branch' }
 
       before do
-        project.repository.create_branch(pipeline_branch)
+        project.repository.create_branch(pipeline_branch, default_branch)
       end
 
       it_behaves_like 'no pipeline yaml error'

spec/lib/gitlab/ci/templates/managed_cluster_applications_gitlab_ci_yaml_spec.rb

@@ -12,7 +12,8 @@ RSpec.describe 'Managed-Cluster-Applications.gitlab-ci.yml' do
     let(:service) { Ci::CreatePipelineService.new(project, user, ref: pipeline_branch ) }
     let(:pipeline) { service.execute!(:push) }
     let(:build_names) { pipeline.builds.pluck(:name) }
-    let(:pipeline_branch) { 'master' }
+    let(:default_branch) { project.default_branch_or_main }
+    let(:pipeline_branch) { default_branch }
 
     before do
       stub_ci_pipeline_yaml_file(template.content)
@@ -28,7 +29,7 @@ RSpec.describe 'Managed-Cluster-Applications.gitlab-ci.yml' do
       let(:pipeline_branch) { 'a_branch' }
 
       before do
-        project.repository.create_branch(pipeline_branch)
+        project.repository.create_branch(pipeline_branch, default_branch)
       end
 
       it 'has no jobs' do

spec/lib/gitlab/ci/templates/terraform_latest_gitlab_ci_yaml_spec.rb

@@ -10,7 +10,7 @@ RSpec.describe 'Terraform.latest.gitlab-ci.yml' do
   subject(:template) { Gitlab::Template::GitlabCiYmlTemplate.find('Terraform.latest') }
 
   describe 'the created pipeline' do
-    let(:default_branch) { 'master' }
+    let(:default_branch) { project.default_branch_or_main }
     let(:pipeline_branch) { default_branch }
     let(:project) { create(:project, :custom_repo, files: { 'README.md' => '' }) }
     let(:user) { project.owner }
@@ -34,7 +34,7 @@ RSpec.describe 'Terraform.latest.gitlab-ci.yml' do
       let(:pipeline_branch) { 'patch-1' }
 
       before do
-        project.repository.create_branch(pipeline_branch)
+        project.repository.create_branch(pipeline_branch, default_branch)
       end
 
       it 'does not creates a deploy and a test job' do