t/t1517: mark tests that fail with GIT_TEST_INSTALLED

The changes added by 39fc408 (t/t1517: automate `git subcmd -h` tests
outside a repository, 2025-08-08) to automatically loop over all "main"
Git commands will, when run against an installed build using
GIT_TEST_INSTALLED rather than the build in the build directory, include
some extra git-gui commands that are installed by `make install`, or
credential helpers that might be installed manually from the contrib
directories.  These fail the test, so record them as such.

Signed-off-by: Adam Dinwoodie <adam@dinwoodie.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: me-and

t/t1517-outside-repo.sh

@@ -111,8 +111,11 @@ for cmd in $(git --list-cmds=main)
 do
 	cmd=${cmd%.*} # strip .sh, .perl, etc.
 	case "$cmd" in
-	archimport | cvsexportcommit | cvsimport | cvsserver | daemon | \
+	archimport | citool | credential-netrc | credential-libsecret | \
+	credential-osxkeychain | cvsexportcommit | cvsimport | cvsserver | \
+	daemon | \
 	difftool--helper | filter-branch | fsck-objects | get-tar-commit-id | \
+	gui | gui--askpass | \
 	http-backend | http-fetch | http-push | init-db | \
 	merge-octopus | merge-one-file | merge-resolve | mergetool | \
 	mktag | p4 | p4.py | pickaxe | remote-ftp | remote-ftps | \