Deprecate enableGitServerCommandExecFilter and make it NOOP
Created by: indradhanush
Follow up on #32030 and also closes #32030.
Part of https://github.com/sourcegraph/security-issues/issues/213.
Searching for EnableGitServerCommandExecFilter in the code now returns only the hits where it is declared in the JSON and the generated schema:
Test plan
Updated tests.