feat: don't add merge-contribution attribute into the dev container

[svor]

What does this PR do?

Update the generator to avoid adding controller.devfile.io/merge-contribution attribute into the developer container, it will be done by the DWO

Screenshot/screencast of this PR

N/A

What issues does this PR fix or reference?

eclipse-che/che#22155

How to test this PR?

1/ Go to che-devfile-registry/tools/devworkspace-generator
2/ Build the tool by running yarn
3/ Generate a devworkspace:

node lib/entrypoint.js \
        --devfile-url:https://github.com/che-samples/java-spring-petclinic/tree/main \
        --plugin-registry-url:https://che-plugin-registry-main.surge.sh/v3/ \
        --editor-entry:che-incubator/che-code/latest \
        --output-file:/tmp/devworkspace-che-code-latest.yaml 

4/ Take a look at the generated file /tmp/devworkspace-che-code-latest.yaml, it should not contain controller.devfile.io/merge-contribution attribute in the components.

5/ Try to start a workspace using generated file by executing oc apply -f /tmp/devworkspace-che-code-latest.yaml, workspace should be started.

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[github-actions]

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[vinokurig]

Tested according to the provided description

[artaleks9]

Tested according to the provided description.
Approved.