[exporter/azuremonitor] migrate semconv from v1.38.0

[codeboten]

Component(s)

exporter/azuremonitor

Describe the issue you're reporting

While removing usage of old semconv imports, i found that this package uses semantic conventions that rely on v1.38.0. Specifically the following attributes:

rpc.system
rpc.service
rpc.grpc.status_code

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[github-actions]

Pinging code owners:

• exporter/azuremonitor: @pcwiese @hgaol

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[vyagh]

can i work on this?