fix(stress-threads): kill only labeled docker containers on loaders

[dimakr]

There is no any filtering of docker instances, when killing containerized stress threads on loader nodes during teardown of a test. In the case of docker backend this can result in deleting all containers in the system.

The change fixes this by labeling stress thread related docker containers when they are created; and deleting only the labeled containers during the teardown.

Fixes: #9027

Testing

• [ ]

PR pre-checks (self review)

• I added the relevant backport labels
• I didn't leave commented-out/debugging code

Reminders

• Add New configuration option and document them (in sdcm/sct_config.py)
• Add unit tests to cover my changes (under unit-test/ folder)
• Update the Readme/doc folder relevant to this change (if needed)

[fruch]

LGTM

[vponomaryov]

LGTM

[soyacz]

@dimakr how did you test it?
backports?

[dimakr]

@dimakr how did you test it? backports?

As it is against docker backend I tested/executed it locally (pausing at the corresponding places to ensure that stress containers are labeled as expected and can be filtered by the labels). And ran test-provision-docker as a regression check.
Wrt to backports, from the original issue it is not clear which version it was failing for, but we can probably backport it 2024.x and 6.x branches, what do you think? (although it is docker backend specific, so not many people are probably using the backend, but still, it would nice to have the patch in some recent versions)
@soyacz

[soyacz]

@dimakr how did you test it? backports?

As it is against docker backend I tested/executed it locally (pausing at the corresponding places to ensure that stress containers are labeled as expected and can be filtered by the labels). And ran test-provision-docker as a regression check. Wrt to backports, from the original issue it is not clear which version it was failing for, but we can probably backport it 2024.x and 6.x branches, what do you think? (although it is docker backend specific, so not many people are probably using the backend, but still, it would nice to have the patch in some recent versions) @soyacz

I suppose people use docker backends with sct master only - as we develop tests on this branch mainly.
LGTM