release: Bump extension version to 2026.11.0 (#26226)

## Summary
- Set the extension to the next odd version, 2026.11.0, without a -dev
suffix as requested.
- Update package-lock.json with version-only changes; dependencies are
unchanged.
- Rebased onto main after #26225 merged.

## Merge order
#26225 is merged. This PR targets main directly.
1. Ensure release/2026.10 exists at the stable 2026.10.0 commit from
#26225.
2. Merge this PR before the next nightly pre-release.

Do not merge this PR into the stable release branch.

## Validation
- Verified package.json and both lockfile version fields agree on
2026.11.0.
- Compared parsed manifests against origin/main and confirmed no
non-version changes.
- git diff --check passed.

---------

Copilot-Session: 75f5808b-7a7d-4fd4-a1ee-b4ac8c340d36

Author: edvilme

package-lock.json

@@ -2,7 +2,7 @@
     "name": "python",
     "displayName": "Python",
     "description": "Python language support with extension access points for IntelliSense (Pylance), Debugging (Python Debugger), linting, formatting, refactoring, unit tests, and more.",
-    "version": "2026.10.0",
+    "version": "2026.11.0",
     "featureFlags": {
         "usingNewInterpreterStorage": true
     },