Update workers spec to use full_path instead of path_with_namespace

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/workers/gitlab/github_import/import_diff_note_worker_spec.rb

@@ -5,7 +5,7 @@ describe Gitlab::GithubImport::ImportDiffNoteWorker do
 
   describe '#import' do
     it 'imports a diff note' do
-      project = double(:project, path_with_namespace: 'foo/bar')
+      project = double(:project, full_path: 'foo/bar')
       client = double(:client)
       importer = double(:importer)
       hash = {

spec/workers/gitlab/github_import/import_issue_worker_spec.rb

@@ -5,7 +5,7 @@ describe Gitlab::GithubImport::ImportIssueWorker do
 
   describe '#import' do
     it 'imports an issue' do
-      project = double(:project, path_with_namespace: 'foo/bar')
+      project = double(:project, full_path: 'foo/bar')
       client = double(:client)
       importer = double(:importer)
       hash = {

spec/workers/gitlab/github_import/import_note_worker_spec.rb

@@ -5,7 +5,7 @@ describe Gitlab::GithubImport::ImportNoteWorker do
 
   describe '#import' do
     it 'imports a note' do
-      project = double(:project, path_with_namespace: 'foo/bar')
+      project = double(:project, full_path: 'foo/bar')
       client = double(:client)
       importer = double(:importer)
       hash = {

spec/workers/gitlab/github_import/import_pull_request_worker_spec.rb

@@ -5,7 +5,7 @@ describe Gitlab::GithubImport::ImportPullRequestWorker do
 
   describe '#import' do
     it 'imports a pull request' do
-      project = double(:project, path_with_namespace: 'foo/bar')
+      project = double(:project, full_path: 'foo/bar')
       client = double(:client)
       importer = double(:importer)
       hash = {