Switch to use W3C backed new metrics and targets

Relates performance#288 (moved)

Switches pipeline to use new Google and W3C backed metrics \ targets:

NAME                                  | FCP (ms) | LCP (ms)        | TBT (ms)         | SI (ms) | LVC (ms) | TFR SIZE (kb) | RESULT
--------------------------------------|----------|-----------------|------------------|---------|----------|---------------|-------
web_group                             | 654      | ✓ 654 (<2500)   | ✓ 930 (<1100)    | 1560    | 2366     | 1210.6        | Passed
web_project                           | 764      | ✓ 764 (<2500)   | ✓ 1090 (<2250)   | 1392    | 2900     | 1009.7        | Passed
web_project_branches                  | 669      | ✓ 669 (<2500)   | ✓ 226 (<300)     | 714     | 1100     | 692.3         | Passed
web_project_commits                   | 704      | ✓ 704 (<2500)   | ✓ 287 (<350)     | 768     | 1200     | 792.1         | Passed
web_project_file_blame                | 881      | ✓ 881 (<2500)   | ✓ 17544 (<27500) | 995     | 18900    | 1560.2        | Passed
web_project_file_rendered             | 687      | ✓ 687 (<2500)   | ✓ 294 (<400)     | 871     | 8233     | 815.3         | Passed
web_project_file_source               | 666      | ✓ 9402 (<15000) | ✓ 8203 (<12500)  | 3008    | 9533     | 1602.0        | Passed
web_project_files                     | 637      | ✓ 1319 (<2500)  | ✓ 3567 (<6000)   | 1481    | 3867     | 1024.6        | Passed
web_project_issue                     | 800      | ✓ 2403 (<3000)  | ✓ 1640 (<3000)   | 879     | 3600     | 1231.1        | Passed
web_project_issues                    | 704      | ✓ 704 (<2500)   | ✓ 347 (<400)     | 745     | 1333     | 869.4         | Passed
web_project_merge_request_changes     | 653      | ✓ 2398 (<3000)  | ✓ 6452 (<17500)  | 4439    | 7500     | 1889.9        | Passed
web_project_merge_request_commits     | 654      | ✓ 654 (<2500)   | ✓ 1011 (<1250)   | 1643    | 2866     | 1666.7        | Passed
web_project_merge_request_discussions | 674      | ✓ 2068 (<2500)  | ✓ 2220 (<4000)   | 1510    | 3900     | 1644.6        | Passed
web_project_merge_requests            | 655      | ✓ 655 (<2500)   | ✓ 271 (<300)     | 683     | 1167     | 815.0         | Passed
web_project_pipelines                 | 619      | ✓ 1753 (<2500)  | ✓ 795 (<1250)    | 1241    | 2433     | 867.2         | Passed
web_user                              | 617      | ✓ 2019 (<2500)  | ✓ 880 (<1250)    | 1492    | 2033     | 779.9         | Passed

Also contains several general fixes \ improvements and output tweaks.