Fix find_branch call sites

app/models/repository.rb

@@ -174,8 +174,8 @@ class Repository
     CommitCollection.new(project, commits, ref)
   end
 
-  def find_branch(name, fresh_repo: true)
-    raw_repository.find_branch(name, fresh_repo)
+  def find_branch(name)
+    raw_repository.find_branch(name)
   end
 
   def find_tag(name)

lib/gitlab/git/repository.rb

@@ -1114,7 +1114,7 @@ module Gitlab
       end
 
       def can_be_merged?(source_sha, target_branch)
-        if target_sha = find_branch(target_branch, true)&.target
+        if target_sha = find_branch(target_branch)&.target
           !gitaly_conflicts_client(source_sha, target_sha).conflicts?
         else
           false

spec/models/repository_spec.rb

@@ -1022,24 +1022,6 @@ describe Repository do
     end
   end
 
-  describe '#find_branch' do
-    context 'fresh_repo is true' do
-      it 'delegates the call to raw_repository' do
-        expect(repository.raw_repository).to receive(:find_branch).with('master', true)
-
-        repository.find_branch('master', fresh_repo: true)
-      end
-    end
-
-    context 'fresh_repo is false' do
-      it 'delegates the call to raw_repository' do
-        expect(repository.raw_repository).to receive(:find_branch).with('master', false)
-
-        repository.find_branch('master', fresh_repo: false)
-      end
-    end
-  end
-
   describe '#update_branch_with_hooks' do
     let(:old_rev) { '0b4bc9a49b562e85de7cc9e834518ea6828729b9' } # git rev-parse feature
     let(:new_rev) { 'a74ae73c1ccde9b974a70e82b901588071dc142a' } # commit whose parent is old_rev