Tweak scenario group vars and project issue search thresholds
Update k6/tests/api/api_v4_projects_issues_search.js
and k6/tests/scenarios/scenario_api_new_group_variables.js
TTFB thresholds
Update k6/tests/api/api_v4_projects_issues_search.js
and k6/tests/scenarios/scenario_api_new_group_variables.js
TTFB thresholds