chore: removing obsolete / deprecated EoL .Net 3.1, 5.0, 6.0

[ibuziuk]

Description of Changes

Deprecation Status of .NET Versions
NET 3.1 was a Long-Term Support (LTS) release, but its support ended on December 13, 2022. Since then, it has been considered deprecated.

NET 5.0 was a Standard Term Support (STS) release, and its support ended much earlier, on May 10, 2022, making it a deprecated version. STS releases have a shorter lifecycle of 18 months.

NET 6.0 was also a Long-Term Support (LTS) release, but its support officially ended on November 12, 2024. This makes it a deprecated version.

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Acceptance Criteria

• Contributing guide

Have you read the devfile registry contributing guide and followed its instructions?

• Test automation

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• Documentation

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• Check Tools Provider

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[openshift-ci]

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[thepetk]

According to the lifecycle policy we have in place, we could start by adding the deprecated tag in the stack and then after a 3 months period remove it.

In case we decide to keep open this PR, we need also to remove the records from the CODEOWNERS file:

registry/.github/CODEOWNERS

Line 14 in fc77c5c

# .Net stacks

[ibuziuk]

@thepetk sorry, but why can't we just remove it? Runtime deprecation happened a long time ago on the Microsoft's end, and on the devfile.io landing page [1] you currently promote obsolete samples at the first place that probably no one is using -

[1] https://registry.devfile.io/viewer

[openshift-ci]

@ibuziuk: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.16-registry-test	6624046	link	true	/test v4.16-registry-test
ci/prow/v4.16-images	6624046	link	true	/test v4.16-images

Full PR test history. Your PR dashboard.

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