Schema Processor - ensure unique Resources

[ankitpatel96]

Component(s)

processor/schema

Is your feature request related to a problem? Please describe.

The Schema Processor doesn't yet ensure Resources are unique when processing resource and all rename_attributes.

Describe the solution you'd like

Ensure that each ResourceLogs has a unique Resource within a plog.Logs object (along with all other signal types)

Describe alternatives you've considered

No response

Additional context

Pointed out by @jsuereth in #35248 (comment)

[github-actions]

Pinging code owners:

• processor/schema: @MovieStoreGuy

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