KTOR-5332 Fixes iOS unit test deadlock occurring with DarwinClientEngine

[adamsousa]

Subsystem
ktor-client-darwin

Motivation
About a year ago, a pull request was made to fix iOS engine deadlock happening when running iOS unit tests. Since recently upgrading to the ktor 2.0, our team has begun to experience this issue in our iOS unit tests. Looking at DarwinClientEngine.kt, the request queue does not specify currentQueue() like the now deprecated IosClientEngine did prior to the ktor 2.0 update.

Solution
Use the current thread for the request queue

[rsinukov]

Thanks for the fix. Do you mind updating queue in ktor-client-darwin-legacy module as well?

[adamsousa]

Sure thing, added

[rsinukov]

LGTM
Will merge after CI run

[rsinukov]

These 4 tests are failing on CI
Can you check them, please?

DarwinEngineTest
  testCookieIsNotPersistedByDefault[macosX64]
  testQueryWithCyrillic[macosX64]
  testQueryWithMultipleParams[macosX64]
  testRequestInRunBlocking[macosX64]

[adamsousa]

Added fix, tests now running blocking call on testing thread

[rsinukov]

I see that code style breaks on imports. Can you fix this too, please?