[processor/resourcedetection] Remove deprecated section `attributes` in favor of `resource_attributes`

[mx-psi]

Component(s)

No response

Describe the issue you're reporting

The attributes option is deprecated:
https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/processor/resourcedetectionprocessor#migration-from-attributes-to-resource_attributes

We should remove it!

It may even make sense to align with the declarative configuration style: https://github.com/open-telemetry/opentelemetry-configuration/blob/58fadbfa903a56339b5a4f3854b1f562cee2190e/examples/kitchen-sink.yaml#L303-L304

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[github-actions]

Pinging code owners for processor/resourcedetection: @Aneurysm9 @dashpole. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triage' to set the priority and remove the needs-triage label.

[github-actions]

Pinging code owners:

• processor/resourcedetection: @Aneurysm9 @dashpole

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[paulojmdias]

I can work on this.

@mx-psi, if you can assign it to me, I appreciate it 🙏

[mx-psi]

Assigned to you!

[paulojmdias]

It may even make sense to align with the declarative configuration style: https://github.com/open-telemetry/opentelemetry-configuration/blob/58fadbfa903a56339b5a4f3854b1f562cee2190e/examples/kitchen-sink.yaml#L303-L304

@dashpole, I would like to have your opinion on this ☝️