Port TestPostContainersAttach and TestPostContainersAttachStderr to integration-cli #12905
Description
As the title says, these 2 tests need to be ported to integration-cli (they aren't in the code base anymore but you can find them at the links below)
TestPostContainerAttach runcom@f7e417e#diff-43dd6c60c47613b163fc23c09dbff200L242
TestPostContainerAttachStderr runcom@f7e417e#diff-43dd6c60c47613b163fc23c09dbff200L318