Removed "cancel parent" from TestBase exception handlers

Author: elizarov

core/kotlinx-coroutines-core/test/TestBase.kt

@@ -146,7 +146,6 @@ public actual open class TestBase actual constructor() {
                     !unhandled[exCount - 1](e) ->
                         printError("Unhandled exception was unexpected: $e", e)
                 }
-                context[Job]?.cancel(e)
             })
         } catch (e: Throwable) {
             ex = e

js/kotlinx-coroutines-core-js/test/TestBase.kt

@@ -81,7 +81,6 @@ public actual open class TestBase actual constructor() {
                 !unhandled[exCount - 1](e) ->
                     printError("Unhandled exception was unexpected: $e", e)
             }
-            context[Job]?.cancel(e)
         }).catch { e ->
             ex = e
             if (expected != null) {

native/kotlinx-coroutines-core-native/test/TestBase.kt

@@ -76,7 +76,6 @@ public actual open class TestBase actual constructor() {
                     !unhandled[exCount - 1](e) ->
                         printError("Unhandled exception was unexpected: $e", e)
                 }
-                context[Job]?.cancel(e)
             })
         } catch (e: Throwable) {
             ex = e