fix: ignore printing io.EOF during WalkDir() on concurrently modified objects

[harshavardhana]

Description

fix: ignore printing io.EOF during WalkDir() on concurrently modified objects

Motivation and Context

less noise, we do not need to print these errors.

How to test this PR?

Create situations such as mc rm -r on a versioned bucket while concurrently
listing such buckets - after a period of time you will see these kinds of errors
cropping up.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Documentation updated
• Unit tests added/updated

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-gateway-s3.sh	✔️
mint-erasure.sh	✔️
mint-dist-erasure.sh	✔️
mint-compress-encrypt-dist-erasure.sh	✔️
mint-pools.sh	✔️
Deleting image on docker hub
Deleting image locally

[vadmeste]

LGTM