JIRA Service: Improve username/email validation

It's a good UX practice to remove leading and trailing whitespaces for
the username/email fields.

app/models/project_services/jira_service.rb

@@ -64,7 +64,7 @@ class JiraService < IssueTrackerService
     url = URI.parse(client_url)
 
     {
-      username: username,
+      username: username&.strip,
       password: password,
       site: URI.join(url, '/').to_s, # Intended to find the root
       context_path: url.path,

spec/models/project_services/jira_service_spec.rb

@@ -19,7 +19,7 @@ describe JiraService do
       described_class.create(
         project: create(:project),
         active: true,
-        username: 'username',
+        username: 'username ',
         password: 'test',
         jira_issue_transition_id: 24,
         url: 'http://jira.test.com/path/'
@@ -35,6 +35,15 @@ describe JiraService do
     it 'leaves out trailing slashes in context' do
       expect(service.options[:context_path]).to eq('/path')
     end
+
+    it 'leaves out trailing whitespaces in username' do
+      expect(service.options[:username]).to eq('username')
+    end
+
+    it 'provides additional cookies to allow basic auth with oracle webgate' do
+      expect(service.options[:use_cookies]).to eq(true)
+      expect(service.options[:additional_cookies]).to eq(['OBBasicAuth=fromDialog'])
+    end
   end
 
   describe 'Associations' do
@@ -93,7 +102,7 @@ describe JiraService do
   end
 
   # we need to make sure we are able to read both from properties and jira_tracker_data table
-  # TODO: change this as part of #63084
+  # TODO: change this as part of https://gitlab.com/gitlab-org/gitlab/issues/29404
   context 'overriding properties' do
     let(:access_params) do
       { url: url, api_url: api_url, username: username, password: password,
@@ -604,26 +613,6 @@ describe JiraService do
     end
   end
 
-  describe 'additional cookies' do
-    let(:project) { create(:project) }
-
-    context 'provides additional cookies to allow basic auth with oracle webgate' do
-      before do
-        @service = project.create_jira_service(
-          active: true, properties: { url: 'http://jira.com' })
-      end
-
-      after do
-        @service.destroy!
-      end
-
-      it 'is initialized' do
-        expect(@service.options[:use_cookies]).to eq(true)
-        expect(@service.options[:additional_cookies]).to eq(['OBBasicAuth=fromDialog'])
-      end
-    end
-  end
-
   describe 'project and issue urls' do
     context 'when gitlab.yml was initialized' do
       it 'is prepopulated with the settings' do