Remove unused method `remote_exists?`

app/models/repository.rb

@@ -1010,10 +1010,6 @@ class Repository
     raw_repository.fetch_source_branch!(source_repository.raw_repository, source_branch, local_ref)
   end
 
-  def remote_exists?(name)
-    raw_repository.remote_exists?(name)
-  end
-
   def compare_source_branch(target_branch_name, source_repository, source_branch_name, straight:)
     raw_repository.compare_source_branch(target_branch_name, source_repository.raw_repository, source_branch_name, straight: straight)
   end

lib/gitlab/git/repository.rb

@@ -940,11 +940,6 @@ module Gitlab
         false
       end
 
-      # Returns true if a remote exists.
-      def remote_exists?(name)
-        rugged.remotes[name].present?
-      end
-
       # Update the specified remote using the values in the +options+ hash
       #
       # Example

spec/lib/gitlab/git/repository_spec.rb

@@ -701,21 +701,6 @@ describe Gitlab::Git::Repository, seed_helper: true do
     end
   end
 
-  describe '#remote_exists?' do
-    before(:all) do
-      @repo = Gitlab::Git::Repository.new('default', TEST_MUTABLE_REPO_PATH, '')
-      @repo.add_remote("new_remote", SeedHelper::GITLAB_GIT_TEST_REPO_URL)
-    end
-
-    it 'returns true for an existing remote' do
-      expect(@repo.remote_exists?('new_remote')).to eq(true)
-    end
-
-    it 'returns false for a non-existing remote' do
-      expect(@repo.remote_exists?('foo')).to eq(false)
-    end
-  end
-
   describe "#log" do
     let(:commit_with_old_name) do
       Gitlab::Git::Commit.decorate(repository, @commit_with_old_name_id)