avoid encoding import url and delegate good format to user

lib/gitlab/import_url.rb

 module Gitlab
   class ImportUrl
     def initialize(url, credentials: nil)
-      @url = URI.parse(encode(url))
+      @url = URI.parse(url)
       @credentials = credentials
     end
 
@@ -37,9 +37,5 @@ module Gitlab
     def valid_credentials?
       credentials && credentials.is_a?(Hash) && credentials.any?
     end
-
-    def encode(url)
-      URI.decode(url).size < url.size ? url : URI.encode(url)
-    end
   end
 end

spec/lib/gitlab/import_url_spec.rb

@@ -19,16 +19,4 @@ describe Gitlab::ImportUrl do
   describe 'credentials' do
     it { expect(import_url.credentials).to eq(credentials) }
   end
-
-  context 'URL encoding' do
-    describe 'not encoded URL' do
-      let(:url) { "https://github.com/me/my project.git" }
-      it { expect(import_url.sanitized_url).to eq("https://github.com/me/my%20project.git") }
-    end
-
-    describe 'already encoded URL' do
-      let(:url) { "https://github.com/me/my%20project.git" }
-      it { expect(import_url.sanitized_url).to eq("https://github.com/me/my%20project.git") }
-    end
-  end
 end