Fix: exclude nested .vscode directories from package publish

[ritesh006]

Fixes #5160

Problem:
pio pkg pack/publish included .vscode directories inside subfolders
(e.g. examples), even though the top-level .vscode was excluded.

Change:
Added **/.vscode/ (and normalized .vscode/ with trailing slash) to
EXCLUDE_DEFAULT. This mirrors .pio handling and ensures both top-level
and nested .vscode folders are excluded automatically.

Manual test:

• Created test package with examples/blink/.vscode/settings.json
• Before patch: file appeared in tarball
• After patch: .vscode excluded from tarball

[ritesh006]

could anyone please review this?