feat(ecstore): continue AHashMap adaptation (partial)

- Update merge_replication_metadata_lww to use generics
- Update restore_metadata_update_preserves_protected_metadata to use generics
- Update has_encrypted_part_layout_marker to use generics
- Update clean_metadata, clean_metadata_keys, remove_standard_storage_class to use generics
- Update update_hash_quorum_metadata_map, update_hash_target_delete_marker_versions to use generics
- Fix fi.metadata assignment to use .into()
- Fix lookup call to use get method
- Fix replacement_metadata to use AHashMap

Note: There are still 14 compilation errors remaining in ecstore.

Refs: https://github.com/rustfs/backlog/issues/2005

Co-Authored-By: heihutu <heihutu@gmail.com>

crates/utils/src/http/header_compat.rs

@@ -89,7 +89,7 @@ pub fn is_object_encryption_marker(key: &str) -> bool {
 }
 
 /// Reads the logical object size recorded by encryption metadata.
-pub fn get_object_encryption_original_size(metadata: &std::collections::HashMap<String, String>) -> std::io::Result<Option<i64>> {
+pub fn get_object_encryption_original_size<S: std::hash::BuildHasher>(metadata: &std::collections::HashMap<String, String, S>) -> std::io::Result<Option<i64>> {
     let actual_size = super::get_str(metadata, super::SUFFIX_ACTUAL_SIZE);
     let size = get_case_insensitive(metadata, RUSTFS_ENCRYPTION_ORIGINAL_SIZE)
         .or_else(|| get_case_insensitive(metadata, SSEC_ORIGINAL_SIZE))
@@ -103,7 +103,7 @@ pub fn get_object_encryption_original_size(metadata: &std::collections::HashMap<
         .map_err(|error| std::io::Error::other(format!("Failed to parse encryption original size: {error}")))
 }
 
-fn get_case_insensitive<'a>(metadata: &'a std::collections::HashMap<String, String>, key: &str) -> Option<&'a str> {
+fn get_case_insensitive<'a, S: std::hash::BuildHasher>(metadata: &'a std::collections::HashMap<String, String, S>, key: &str) -> Option<&'a str> {
     metadata.get(key).map(String::as_str).or_else(|| {
         metadata
             .iter()