Pull all test images to avoid timing issues during tests

[Stringy]

Description

This PR will pre-pull test images on CI to make test execution times more consistent. There is currently a situation where test setup might start various containers and then wait to pull an image. When the timing of events is important/crucial, this waiting can cause flakes.

This behaviour is disabled when running individual test suites because the upfront performance penalty is significant at that level. I have yet to figure out a neat way of only pulling the images that the requested test uses, but that can be looked at in a follow up if it is deemed useful.

Checklist

• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added unit tests
• Added integration tests
• Added regression tests

If any of these don't apply, please comment below.

Testing Performed

Tested locally, with timings:

# with pre-pulling images:

➜  collector git:(giles/ROX-14542-pre-pull-all-images) ✗ time make -C ansible/ integration-tests COLLECTION_METHODS=core-bpf COLLECTOR_IMAGE=quay.io/stackrox-io/collector:3.16.0 COLLECTOR_TEST=TestProcessNetwork
ansible-playbook \
		-i dev \
		-e job_id="ghutton" \
		-e @secrets.yml \
		--tags run-tests \
		integration-tests.yml
...................
# run-test-target : Run integration tests *********************************************************************************
  * collector-dev-garden-linux-any-777da73a-ghutton- changed=True --  -------------------------
......

# STATS *******************************************************************************************************************
collector-dev-garden-linux-any-777da73a-ghutton    : ok=26	changed=13	failed=0	unreachable=0	rescued=0	ignored=0

________________________________________________________
Executed in  376.03 secs    fish           external
   usr time   52.34 secs    0.13 millis   52.34 secs
   sys time   13.40 secs    1.55 millis   13.40 secs

# without pre-pulling images:

➜  collector git:(giles/ROX-14542-pre-pull-all-images) ✗ time make -C ansible/ integration-tests COLLECTION_METHODS=core-bpf COLLECTOR_IMAGE=quay.io/stackrox-io/collector:3.16.0 COLLECTOR_TEST=TestProcessNetwork
ansible-playbook \
		-i dev \
		-e job_id="ghutton" \
		-e @secrets.yml \
		--tags run-tests \
		integration-tests.yml
.............
# run-test-target : Run integration tests *********************************************************************************
  * collector-dev-garden-linux-any-777da73a-ghutton- changed=True --  -------------------------
......

# STATS *******************************************************************************************************************
collector-dev-garden-linux-any-777da73a-ghutton    : ok=20	changed=9	failed=0	unreachable=0	rescued=0	ignored=0

________________________________________________________
Executed in  228.68 secs    fish           external
   usr time   44.81 secs    0.14 millis   44.81 secs
   sys time   10.31 secs    1.60 millis   10.31 secs

[Molter73]

LGTM!

[github-actions]

Kernel	Method	Without Collector Time (secs)	With Collector Time (secs)	Baseline median (secs)	Collector median (secs)	PValue