s3: tests for wildcard support in conditional read

[sungjoon-koh]

Add test for wildcard '*' support in conditional read.
ceph pr: ceph/ceph#64428

fallocate test --len 10MB
aws s3api create-bucket --bucket test
aws s3api put-object --bucket test --key test --body test

# 412 -> 200
aws s3api get-object --bucket test --key test --if-match "*" test-res

# 200 -> 304
aws s3api get-object --bucket test --key test --if-none-match "*" test-res

# 412 -> 304
aws s3api get-object --bucket test --key test --if-none-match "*" --if-match "*" test-res