Remove atomics section from codereview_guideline.md

[rahulkaukuntla]

What does this PR do?

Due to golang/go#50860, with the adoption of go version 1.19:

The sync/atomic package defines new atomic types Bool, Int32, Int64, Uint32, Uint64, Uintptr, and Pointer. These types hide the underlying values so that all accesses are forced to use the atomic APIs. Int64 and Uint64 are automatically aligned to 64-bit boundaries in structs and allocated data, even on 32-bit systems.

This repo is already >1.19, so we don't need to move over to the uber atomic library.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep coverage for primitive atomic APIs

This deletion removes the reviewer-facing warning about sync/atomic, but the Go 1.19 alignment fix only covers the new typed values; primitive 64-bit functions such as atomic.AddUint64 still require caller-arranged alignment on ARM/386/32-bit MIPS, and the public Go guideline still tells contributors to use go.uber.org/atomic instead (docs/public/guidelines/languages/go.md:122-130). With this gone, a PR adding primitive sync/atomic on a struct field can pass review while remaining broken on supported 32-bit/ARM targets, so please replace this with a narrower rule for primitive APIs rather than removing it outright.

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[dd-octo-sts]

Files inventory check summary

File checks results against ancestor cf57354d:

Results for datadog-agent_7.82.0~devel.git.498.02e5c10.pipeline.121972054-1_amd64.deb:

No change detected