[k8sattributes] Rename k8sattributes processor to k8s_attributes

[ChrsMark]

Component(s)

processor/k8sattributes

Describe the issue you're reporting

With the convention for component names established to lower_snake_case in open-telemetry/opentelemetry-collector#14208 and a practical method to migrate existing components implemented in open-telemetry/opentelemetry-collector#14349, the component names needs to be updated accordingly.

Check #45339 for details.

Tip

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[github-actions]

Pinging code owners:

• processor/k8sattributes: @dmitryax @fatsheep9146 @TylerHelmuth @ChrsMark @odubajDT

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