chore(windows): Fix tests CS stop reliability

Recently, some tests have been observed to fail on Windows client CI
due to the chunkserver stop command related operations not taking effect
immediately, which causes these tests to be flaky.

To mitigate this issue, a short sleep is added after stopping the
chunkserver to ensure that the stop command and its subsequent
operations have taken effect before proceeding with the test operations.

Co-authored-by: Dave <dave@leil.io>

Signed-off-by: rolysr <rolysr@leil.io>

Author: rolysr

tests/test_suites/ShortSystemTests/test_ec_read_combinations.sh

@@ -16,6 +16,7 @@ for i in {0..7}; do
 	for cs in {0..2}; do
 		saunafs_chunkserver_daemon $(((i + cs) % 8)) stop
 	done
+	saunafs_wait_for_ready_chunkservers 6
 	if ! file-validate "$dir/file"; then
 		test_add_failure "Data read from file without chunkservers $i-$(((i + cs) % 8)) is different than written"
 	fi

tests/test_suites/ShortSystemTests/test_truncate_retry.sh

@@ -13,13 +13,15 @@ FILE_SIZE=1234 file-generate file
 checksum123="$(head -c 123 file | md5sum)"
 
 saunafs_chunkserver_daemon 0 stop
+saunafs_wait_for_ready_chunkservers 0
 assert_awk_finds '/no valid copies/' "$(saunafs fileinfo file)"
 # Following operation should pass - wake up just after 4th try (0.2 + 0.4 + 0.8 + 1.6 = 3.0s)
 (sleep 3.1 && saunafs_chunkserver_daemon 0 start) & truncate -s 123 file
 assert_awk_finds '/[0-9A-F]+_00000002/' "$(saunafs fileinfo file)"
 assert_equals "$checksum123" "$(cat file | md5sum)"
 
 saunafs_chunkserver_daemon 0 stop
+saunafs_wait_for_ready_chunkservers 0
 assert_awk_finds '/no valid copies/' "$(saunafs fileinfo file)"
 # Following operation shouldn't pass - waiting time's exceeded
 sleep 12.7 && saunafs_chunkserver_daemon 0 start &