ROX-28879: Update ScannerV2&Collector Konflux image checks/4.7

[msugakov]

Description

Cherry-picked from 7ea688772e26babd81c57709942dd043b88656e9 (https://github.com/stackrox/stackrox/pull/14827) to release-4.7.

Trying to figure when it's comfortable to merge the change in https://redhat-internal.slack.com/archives/C08CG1N8HBP/p1744214856614999

User-facing documentation

• [x] CHANGELOG is updated OR update is not needed
• [x] documentation PR is created and is linked above OR is not needed

Testing and quality

• [x] the change is production ready: the change is GA or otherwise the functionality is gated by a feature flag
• [ ] CI results are inspected

Automated testing

No change.

How I validated my change

Only looking at CI.

Summary by Sourcery

Consolidate and improve GitHub Actions workflows for checking Collector and Scanner image availability

CI:

• Refactored image existence checks for Collector and Scanner images in GitHub Actions workflows
• Combined separate image existence check jobs into a single, more comprehensive workflow job

Chores:

• Updated GitHub Actions workflow configuration to streamline image verification process

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This PR consolidates the image existence checks for Collector and Scanner into a single workflow in style.yaml. The previous checks in build.yaml were removed. The new workflow verifies the existence of both GHA-built and Konflux-built images for the specified components.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Consolidated image existence checks for Collector and Scanner into a single workflow.	Removed the check-collector-images-exist job from build.yaml. Removed the check-scanner-images-exist job from build.yaml. Added a new job check-collector-and-scanner-images-exist to style.yaml. The new job checks for the existence of both GHA-built and Konflux-built images for collector and scanner. The new job uses a matrix strategy to check for collector, scanner, scanner-slim, scanner-db, and scanner-db-slim images. The new job retrieves the image tag from the COLLECTOR_VERSION or SCANNER_VERSION file. The new job checks for the existence of images with and without the -fast suffix.	.github/workflows/build.yaml .github/workflows/style.yaml

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[msugakov]

Having to backport collector 3.21.0 as 3.21.1 (technically it's the same commit) due to the absence of the latter:

$ podman pull quay.io/rhacs-eng/collector:3.21.0-fast
$ podman tag quay.io/rhacs-eng/collector:3.21.0-fast quay.io/rhacs-eng/collector:3.21.1-fast
$ podman push quay.io/rhacs-eng/collector:3.21.1-fast

[msugakov]

/retest retag-collector

[rhacs-bot]

Images are ready for the commit at de3ecf5.

To use with deploy scripts, first export MAIN_IMAGE_TAG=4.7.2-rc.3-1-gde3ecf57ce.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 49.07%. Comparing base (1ad9c47) to head (de3ecf5). Report is 2 commits behind head on release-4.7.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-4.7   #14941   +/-   ##
============================================
  Coverage        49.07%   49.07%           
============================================
  Files             2515     2515           
  Lines           182893   182893           
============================================
+ Hits             89746    89747    +1     
+ Misses           86027    86025    -2     
- Partials          7120     7121    +1     

Flag	Coverage Δ
go-unit-tests	49.07% <ø> (+<0.01%)	:arrow_up:

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[msugakov]

@dcaravel please merge this one for 4.7.3.