receiver/[k8scluster/kubeletstats]: Replace package constansts in favor of constants from conventions in core

[asuresh4]

Description: Use constants from go.opentelemetry.io/collector/translator/conventions

[pmcollins]

LGTM

[codecov]

Codecov Report

Merging #2996 (d0789d3) into main (665fae9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2996   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         464      464           
  Lines       22798    22798           
=======================================
+ Hits        20870    20871    +1     
+ Misses       1436     1434    -2     
- Partials      492      493    +1     

Flag	Coverage Δ
integration	68.96% <ø> (ø)
unit	90.51% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...eceiver/k8sclusterreceiver/collection/collector.go	41.33% <ø> (ø)
receiver/k8sclusterreceiver/collection/nodes.go	100.00% <100.00%> (ø)
receiver/k8sclusterreceiver/collection/pods.go	94.11% <100.00%> (ø)
receiver/kubeletstatsreceiver/kubelet/resource.go	100.00% <100.00%> (ø)
...rometheusexecreceiver/subprocessmanager/manager.go	70.00% <0.00%> (-6.00%)	⬇️
processor/groupbytraceprocessor/event.go	96.77% <0.00%> (+0.80%)	⬆️
receiver/prometheusexecreceiver/receiver.go	88.33% <0.00%> (+2.50%)	⬆️

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