refactor(s3-client): reuse rustfs-utils header classification instead of duplicating it (#6758)

crates/s3-client/src/utils.rs carried a verbatim copy of the header
classification tables and predicates owned by
crates/utils/src/http/headers.rs: SUPPORTED_HEADERS (same 11 keys),
SUPPORTED_QUERY_VALUES (same 9 keys), and is_standard_header /
is_storageclass_header / is_amz_header / is_rustfs_header /
is_minio_header with byte-identical bodies. The duplication was already
half-resolved and inconsistent — the local is_amz_header called
rustfs_utils::http::is_sse_header while consulting its own tables — and
s3-client already depends on rustfs-utils with the "full" feature, so
reusing the canonical owner adds no crate edge.

The sole caller, PutObjectOptions::header(), now imports the five
predicates from rustfs_utils::http. Semantics are unchanged: both sides
normalize with to_lowercase(), return false for unknown keys, and the
storage-class constants are the same string ("x-amz-storage-class" from
s3s::header::X_AMZ_STORAGE_CLASS vs rustfs_utils AMZ_STORAGE_CLASS), so
the set of user-metadata headers passed through verbatim rather than
prefixed with x-amz-meta- is identical.

SUPPORTED_QUERY_VALUES is deleted outright: s3-client had no reader for
it (utils consumes its own copy via is_standard_query_value). The
base64_encode/base64_decode helpers and their rustfs/rustfs#4811
regression test stay untouched, and lazy_static remains a dependency
because crates/s3-client/src/constants.rs still uses it.

Refs rustfs/backlog#2050

crates/s3-client/src/api_put_object.rs

@@ -24,6 +24,7 @@ use std::{collections::HashMap, sync::Arc};
 use time::{Duration, OffsetDateTime, macros::format_description};
 use tracing::{error, info, warn};
 
+use rustfs_utils::http::{is_amz_header, is_minio_header, is_rustfs_header, is_standard_header, is_storageclass_header};
 use s3s::dto::{ObjectLockLegalHoldStatus, ObjectLockRetentionMode, ReplicationStatus};
 use s3s::header::{
     X_AMZ_OBJECT_LOCK_LEGAL_HOLD, X_AMZ_OBJECT_LOCK_MODE, X_AMZ_OBJECT_LOCK_RETAIN_UNTIL_DATE, X_AMZ_REPLICATION_STATUS,
@@ -40,7 +41,6 @@ use crate::{
     constants::{ISO8601_DATEFORMAT, MAX_MULTIPART_PUT_OBJECT_SIZE, MIN_PART_SIZE},
     credentials::SignatureType,
     transition_api::{ReaderImpl, TransitionClient, UploadInfo},
-    utils::{is_amz_header, is_minio_header, is_rustfs_header, is_standard_header, is_storageclass_header},
 };
 
 #[derive(Debug, Clone)]