ci: publish daily Marketplace pre-releases with odd minor versions - #1833

Reviewed c00f3ccfa6e6ff7fc6b8419cf944c131675cc26b. I found no blocking defects in the changed code. The odd/even minor scheme, packaging-only version rewrite, verification gates, and duplicate handling are consistent with #1751.

Validation:

• All five extension-version tests passed.
• Packaged the PR revision with vsce package --pre-release --no-dependencies, confirmed version 3.1.20261006 and Microsoft.VisualStudio.Code.PreRelease=true in the VSIX, and passed the packaged sess source-identity check.
• Executed the actual prepare shell step with mocked GitHub API responses for seven cases: first publication, unchanged revision, changed revision, retry retaining its original date, retry older than a successful run, an already-covered date, and a change after a skipped day.

The existing Copilot permission finding appears to be a false positive. The pinned artifact action authenticates uploads with ACTIONS_RUNTIME_TOKEN, rather than GITHUB_TOKEN; actions: write is not needed for this upload. Keep the current permissions. The overview's status-filter concern also does not apply: the workflow-runs API explicitly accepts conclusions such as status=success, which I also verified against the repository's runs.

Build, lint, Linux tests, and Windows tests have passed; macOS tests were still pending when checked. Actual scheduled execution and registry publication still need to be verified after merging.

LGTM Thanks!