Added decom test with KES using sse-s3 and sse-kms

[shtripat]

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers
under the terms of the Apache 2 license.
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contributions to the project maintainers under the Apache 2 license.

Description

Motivation and Context

How to test this PR?

./docs/distributed/decom-encrypted-kes.sh

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)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[shtripat]

Needs minio/mc#4924

[shtripat]

decom-test would fail till required mc PR merged and latest mc available.