fix(ios): support flutter via patrol's only-testing option

[Malinskiy]

requires augmenting test parser and xcodebuild's result parser

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0106217) 59.31% compared to head (17a835d) 59.31%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #879 +/- ## ========================================== Coverage 59.31% 59.31% Complexity 798 798 ========================================== Files 214 214 Lines 4437 4437 Branches 707 707 ========================================== Hits 2632 2632 Misses 1476 1476 Partials 329 329 ```

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