[clang][deps] Remove the -full-command-line flag

This patch removes the `-full-command-line` option from `clang-scan-deps`. It's only used with `-format=experimental-full`, where omitting the command lines doesn't make much sense. There are no tests without `-full-command-line`.

Depends on D100531.

Reviewed By: Bigcheese

Differential Revision: https://reviews.llvm.org/D100533