Add support for step inheritance in plan imports

[skycastlelily]

Fixes: #4377

Introduces step inheritance functionality for plan imports, allowing plans to
inherit step configurations from imported plans while maintaining the ability
to override specific settings.
replace(=),append(+) are all supported.

Pull Request Checklist

• implement the feature
• write the documentation
• extend the test coverage
• update the specification
• adjust plugin docstring
• modify the json schema
• mention the version
• include a release note

[therazix]

We need to discuss this first and decide on the overall direction before diving into implementation.

[mcasquer]

From the hacking session, we need to decide what to do with this PR, either merge it or overwrite it

[mcasquer]

Lili is also going to take a look to the adjust test as it should be similar

[LecrisUT]

Right now we use

tmt/tmt/schemas/discover/fmf.yaml

Lines 116 to 117 in e35ba6d

	adjust-tests:
	$ref: "/schemas/core#/definitions/adjust"

I don't think we have a good way to do the schema validation for fmf patterns, so I think it would be better to skip it like in the part above. The explicit Step inheritance operators should also not be needed.

[skycastlelily]

Sorry for the late response, was on year-end party,and addressed: cc9d557 :)

[LecrisUT]

The interface in adjust-tests is like

/plan:
  discover:
    how: fmf
    adjust-tests:
      - check+:
          - how: avc
/test:
  test: /usr/bin/true
  check: dmesg

So translating the interface to the plan.import feature for the case above it should look like:

plan:
  import:
    url: https://github.com/teemtee/tests
    name: /plans/remote
    adjust-prepare:
      prepare+:
        - how: shell
          script: echo "Local prepare"
    adjust-finish:
      finish:
        how: shell
        script: echo "Local finish"

I am realizing that the adjust-* is excessive in this case, so it should probably instead be merged into a single key like:

plan:
  import:
    url: https://github.com/teemtee/tests
    name: /plans/remote
    adjust-plans:
      prepare+:
        - how: shell
          script: echo "Local prepare"
      finish:
        how: shell
        script: echo "Local finish"

[skycastlelily]

Addressed: cc9d557 :)

[LecrisUT]

Awesome work on this looks neat. Just a few minor comments

[skycastlelily]

Awesome work on this looks neat. Just a few minor comments

Thanks for your review,you are supposed to be enjoying your holidays 🎄 ⭐ ,btw:)