ci: derive VS Code extension version from release tag

[diofeher]

Summary

• The release workflow failed on the Publish to Marketplace step because package.json was pinned to 0.0.1, which already exists in the marketplace (failed run).
• Rewrite the extension version from the release tag (v1.2.3 → 1.2.3) before packaging, so each tagged release publishes a unique version without needing a manual package.json bump per release.
• Left a TODO comment flagging that the committed package.json version is intentionally stale; long-term we should keep it in sync (e.g. bump on the release PR) rather than derive it from the tag.

Test plan

• Cut a test tag (or re-run the failed workflow) and confirm each *.vsix is packaged with the tag version.
• Confirm Publish to Marketplace succeeds for all six vsce_target matrix entries.
• Confirm workflow_dispatch runs (no tag) still package successfully using the in-tree version.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 94d59af9-3a6c-46a7-9073-042f2d467905

📥 Commits

Reviewing files that changed from the base of the PR and between d152cc8 and c7e872a.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-vsce-version

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[diofeher]

This is just a workaround to not fail the publishing because we forgot to bump the package.json. Long-term a automated solution should be built