Add CI step to publish releases to open-vsx registry.

[agrojean-ledger]

Waiting on EclipseFdn/publish-extensions#1138 to be merged : actually not necessary.

[agrojean-ledger]

@tdejoigny-ledger @cedelavergne-ledger FYI
Organisation token has been added by @sergii-shkolin to the action secrets to be able to publish to open-vsx

[Copilot]

Pull request overview

This PR updates the extension release pipeline so that tagged releases are packaged into a VSIX once and then published to both the Visual Studio Marketplace and the Open VSX Registry.

Changes:

• Bump extension version to 2.4.2 and add a changelog entry for the release.
• Add npm scripts to package a VSIX and to publish from a VSIX (including Open VSX publishing).
• Update the GitHub Actions publish workflow to package once and publish to Marketplace + Open VSX (release tags only).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
package.json	Version bump and new scripts for VSIX packaging + publishing (Marketplace and Open VSX).
CHANGELOG.md	Add release notes for 2.4.2.
.github/workflows/publish.yml	Package VSIX and publish to Marketplace; additionally publish to Open VSX for non-pre-release tags.

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[tdejoigny-ledger]

@agrojean-ledger could be interesting to check the copilot comments

[agrojean-ledger]

@agrojean-ledger could be interesting to check the copilot comments

Yep, all fixed @tdejoigny-ledger .