Fix time-dependent spec failures in user_sees_error_details_spec.rb

These features specs were failing because they were using fixed dates
and attempting to use Timecop, but Timecop doesn't apply to the browser.
When the date crossed the 8th of the month, the Timeago text "1 month
ago" advanced to "2 months ago".

To fix this issue, we now adjust the test data to use a timestamp
relative to today's date, eliminating the need for Timecop.

Closes https://gitlab.com/gitlab-org/gitlab/issues/202678

spec/support/shared_contexts/features/error_tracking_shared_context.rb

@@ -11,17 +11,25 @@ shared_context 'sentry error tracking context feature' do
   let_it_be(:event_response) { JSON.parse(event_response_body) }
   let(:sentry_api_urls) { Sentry::ApiUrls.new(project_error_tracking_settings.api_url) }
   let(:issue_id) { issue_response['id'] }
+  let(:issue_seen) { 1.year.ago.utc }
+  let(:formatted_issue_seen) { issue_seen.strftime("%Y-%m-%d %I:%M:%S%p %Z") }
+  let(:date_received) { 1.month.ago.utc }
 
   before do
     request_headers = { 'Authorization' => 'Bearer access_token_123', 'Content-Type' => 'application/json' }
     response_headers = { 'Content-Type' => 'application/json' }
+
+    issue_response['firstSeen'] = issue_seen.iso8601(6)
+    issue_response['lastSeen'] = issue_seen.iso8601(6)
+    event_response['dateReceived'] = date_received.iso8601(6)
+
     issue_url = sentry_api_urls.issue_url(issue_id).to_s
     stub_request(:get, issue_url)
       .with(headers: request_headers)
-      .to_return(status: 200, body: issue_response_body, headers: response_headers)
+      .to_return(status: 200, body: issue_response.to_json, headers: response_headers)
     event_url = sentry_api_urls.issue_latest_event_url(issue_id).to_s
     stub_request(:get, event_url)
       .with(headers: request_headers)
-      .to_return(status: 200, body: event_response_body, headers: response_headers)
+      .to_return(status: 200, body: event_response.to_json, headers: response_headers)
   end
 end

spec/support/shared_examples/features/error_tracking_shared_example.rb

@@ -24,13 +24,11 @@ shared_examples 'error tracking index page' do
   end
 
   it 'renders the error index data' do
-    Timecop.freeze(2020, 01, 01, 12, 0, 0) do
-      within('div.error-list') do
-        expect(page).to have_content(issues_response[0]['title'])
-        expect(page).to have_content(issues_response[0]['count'].to_s)
-        expect(page).to have_content(issues_response[0]['last_seen'])
-        expect(page).to have_content('1 year ago')
-      end
+    within('div.error-list') do
+      expect(page).to have_content(issues_response[0]['title'])
+      expect(page).to have_content(issues_response[0]['count'].to_s)
+      expect(page).to have_content(issues_response[0]['last_seen'])
+      expect(page).to have_content('1 year ago')
     end
   end
 end
@@ -54,17 +52,15 @@ shared_examples 'error tracking show page' do
   it 'renders the error details' do
     release_short_version = issue_response['firstRelease']['shortVersion']
 
-    Timecop.freeze(2020, 01, 01, 12, 0, 0) do
-      expect(page).to have_content('1 month ago by raven.scripts.runner in main')
-      expect(page).to have_content(issue_response['metadata']['title'])
-      expect(page).to have_content('level: error')
-      expect(page).to have_content('Error Details')
-      expect(page).to have_content('GitLab Issue: https://gitlab.com/gitlab-org/gitlab/issues/1')
-      expect(page).to have_content("Sentry event: https://sentrytest.gitlab.com/sentry-org/sentry-project/issues/#{issue_id}")
-      expect(page).to have_content("First seen: 1 year ago (2018-11-06 9:19:55PM UTC) Release: #{release_short_version}")
-      expect(page).to have_content('Events: 1')
-      expect(page).to have_content('Users: 0')
-    end
+    expect(page).to have_content('1 month ago by raven.scripts.runner in main')
+    expect(page).to have_content(issue_response['metadata']['title'])
+    expect(page).to have_content('level: error')
+    expect(page).to have_content('Error Details')
+    expect(page).to have_content('GitLab Issue: https://gitlab.com/gitlab-org/gitlab/issues/1')
+    expect(page).to have_content("Sentry event: https://sentrytest.gitlab.com/sentry-org/sentry-project/issues/#{issue_id}")
+    expect(page).to have_content("First seen: 1 year ago (#{formatted_issue_seen}) Release: #{release_short_version}")
+    expect(page).to have_content('Events: 1')
+    expect(page).to have_content('Users: 0')
   end
 
   it 'renders the stack trace heading' do