revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/t/t7105-reset-patch.sh

@@ -38,27 +38,6 @@ test_expect_success PERL 'git reset -p HEAD^' '
 	test_i18ngrep "Apply" output
 '
 
-test_expect_success PERL 'git reset -p HEAD^^{tree}' '
-	test_write_lines n y | git reset -p HEAD^^{tree} >output &&
-	verify_state dir/foo work parent &&
-	verify_saved_state bar &&
-	test_i18ngrep "Apply" output
-'
-
-test_expect_success PERL 'git reset -p HEAD^:dir/foo (blob fails)' '
-	set_and_save_state dir/foo work work &&
-	test_must_fail git reset -p HEAD^:dir/foo &&
-	verify_saved_state dir/foo &&
-	verify_saved_state bar
-'
-
-test_expect_success PERL 'git reset -p aaaaaaaa (unknown fails)' '
-	set_and_save_state dir/foo work work &&
-	test_must_fail git reset -p aaaaaaaa &&
-	verify_saved_state dir/foo &&
-	verify_saved_state bar
-'
-
 # The idea in the rest is that bar sorts first, so we always say 'y'
 # first and if the path limiter fails it'll apply to bar instead of
 # dir/foo.  There's always an extra 'n' to reject edits to dir/foo in