tests: assume the hooks are disabled by default

Stop moving the .git/hooks directory out of the way, or creating it
during test setup. Instead assume that it will contain
harmless *.sample files.

That we can assume that is discussed in point #4 of
f0d4d39 (test-lib: split up and deprecate test_create_repo(),
2021-05-10), those parts of this could and should have been done in
that change.

Removing the "mkdir -p" here will then validate that our templates are
being used, since we'd subsequently fail to create a hook in that
directory if it didn't exist. Subsequent commits will have those hooks
created by a "test_hook" wrapper, which will then being doing that
same validation.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1416-ref-transaction-hooks.sh

@@ -8,7 +8,6 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 . ./test-lib.sh
 
 test_expect_success setup '
-	mkdir -p .git/hooks &&
 	test_commit PRE &&
 	PRE_OID=$(git rev-parse PRE) &&
 	test_commit POST &&

t/t5516-fetch-push.sh

@@ -28,8 +28,7 @@ mk_empty () {
 	(
 		cd "$repo_name" &&
 		git init &&
-		git config receive.denyCurrentBranch warn &&
-		mv .git/hooks .git/hooks-disabled
+		git config receive.denyCurrentBranch warn
 	)
 }
 

t/t7519-status-fsmonitor.sh

@@ -56,7 +56,6 @@ test_lazy_prereq UNTRACKED_CACHE '
 '
 
 test_expect_success 'setup' '
-	mkdir -p .git/hooks &&
 	: >tracked &&
 	: >modified &&
 	mkdir dir1 &&
@@ -322,7 +321,6 @@ test_expect_success UNTRACKED_CACHE 'ignore .git changes when invalidating UNTR'
 	test_create_repo dot-git &&
 	(
 		cd dot-git &&
-		mkdir -p .git/hooks &&
 		: >tracked &&
 		test-tool chmtime =-60 tracked &&
 		: >modified &&