Increase TTFB thresholds for intermittently failing tests
The MR increases TTFB thresholds for intermittently failing tests.
For example Search API tests are over 13000ms for blobs:
http_req_tls_handshaking........: avg=0.00ms min=0.00ms med=0.00ms max=0.00ms p(90)=0.00ms p(95)=0.00ms
http_req_waiting................: avg=7302.68ms min=49.04ms med=7400.83ms max=38281.92ms p(90)=10204.74ms p(95)=11025.49ms
✗ { endpoint:blobs }............: avg=9543.43ms min=955.92ms med=8655.78ms max=38281.92ms p(90)=15404.48ms p(95)=19141.94ms
✓ { endpoint:commits }..........: avg=7403.46ms min=267.52ms med=7818.88ms max=12865.95ms p(90)=10095.65ms p(95)=10561.14ms
✓ { endpoint:issues }...........: avg=7266.99ms min=109.38ms med=7684.07ms max=13026.66ms p(90)=10038.11ms p(95)=10523.38ms
✓ { endpoint:merge_requests }...: avg=7324.73ms min=234.36ms med=7744.89ms max=12653.91ms p(90)=10026.96ms p(95)=10514.85ms
✓ { endpoint:milestones }.......: avg=7148.81ms min=82.50ms med=7587.46ms max=12028.35ms p(90)=9863.90ms p(95)=10336.83ms
✓ { endpoint:users }............: avg=5128.70ms min=49.04ms med=5912.50ms max=7913.82ms p(90)=7067.35ms p(95)=7252.91ms