fix(esp_modem): run CI build job for all targets

[david-cermak]

Simplified the workflow, use idf-build-apps package to find apps for all supported targets.

Additional changes:

• removed IDFv4.1 from tests
• added common build_apps.py utility for finding/building apps
• restructured workflow files and rules:
  • <component>__<test_type>.yml -- component related test workflow (need the component label to run it in PR)
  • common_check.yml -- runs unconditionally

Future changes:

• all components to use local build_apps.py for all targets
• simplify upload_artifact job using ci/clean_build_artifacts.sh (as done in esp_modem target tests)
• build for all combination of supported IDF versions per component

[gabsuren]

Just a question regarding full test set running. Do we need such label also?

[gabsuren]

LGTM!
2 questions

1. Wouldn't it be nice also have a label run_all or smt. to be able run all test sets?
2. When merging to the master all test sets should be run automatically, in this case will they be executed in that way?

[david-cermak]

Thanks for the review, both points make sense -- will address, thanks!

1. Wouldn't it be nice also have a label run_all or smt. to be able run all test sets?

good point, will add support for this new label to run everything.

2. When merging to the master all test sets should be run automatically, in this case will they be executed in that way?

ATM it would check the modification paths to run only relevant tests. But I agree that we should check all components after merge to keep master branch clean,. will fix,

[david-cermak]

1. Wouldn't it be nice also have a label run_all or smt. to be able run all test sets?

I've decided not to implement one common label, since it would unnecessarily complicate the conditions (and would need to apply it everywhere). we can always add it in future if needed. for now, I don't think we'd have too many PRs affecting multiple components and if so, we can add more labels.

-    if: contains(github.event.pull_request.labels.*.name, 'mdns')
+    if: $${ contains(github.event.pull_request.labels.*.name, 'mdns') && contains(github.event.pull_request.labels.*.name, 'run_all') }}

2. When merging to the master all test sets should be run automatically, in this case will they be executed in that way?

Done.