fix: get rid of large buffers

[harshavardhana]

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Description

fix: get rid of large buffers

Motivation and Context

these lead to run-away usage of memory
beyond which the Go's GC can handle, we
have to re-visit this differently, remove
this is for now.

How to test this PR?

Needs a large busy cluster, the change is self explanatory.

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

[harshavardhana]

Getting rid of these buffers @klauspost, as I saw that in a customer environment with huge PUTs, this can lead to severe GC pressure.

We have to revisit this later perhaps by re-using globalByteCapPool()