Change the VS code config as follows:

• Use the correct path to the python executable (python doesn't exists for me in bin, but python3 does)
• Remove deprecated/unused config options
• Exclude symlinks to sage/src from search, since otherwise they show up as multiple hits (please add such symlinks in the vs config in the future).

CC: @mkoeppe @fchapoton @jhpalmieri

Component: build

Author: Tobias Diez

Branch/Commit: 6f809f5

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/33450