NC | Revert url encode/decode of xattr values

[romayalon]

Explain the changes

1. Revert code added in S3 | EncodeURIComponent / DecodeURIComponent xattr #7986
2. Added try & catch that skips xattr headers that can not be set during setHeader() by assuming that xattrs that can be returned are coming through s3. If invalid xattrs were set directly on the file system and can not return through http header, the best behavior is not to fail the head object but to not return the invalid xattr. If customer wants to get invalid headers via s3 the xattr should be encoded on the file system if they are not us-ascii.

Issues: Fixed #xxx / Gap #xxx

Testing Instructions:

• Doc added/updated
• Tests added