[infra] Explicitly pass 'debug' to pub_integration_test step from pkg_linux_debug config.
[infra] Explicitly pass 'debug' to pub_integration_test step from pkg_linux_debug config.

This is follow-up to https://dart-review.googlesource.com/c/sdk/+/87984 with temporary workaround.

Change-Id: I8077f636608c4e9c223c679ffc03151f7c5b83d8
Reviewed-on: https://dart-review.googlesource.com/c/88040
Reviewed-by: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>
Commit-Queue: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>

dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk