Remove k8sobjectsreceiver from edot

The `k8sobjectsreceiver` has been removed from the edot kube-stack in #11944, which was done for #10147 .

Since k8sobjectsreceiver is no longer needed as we now use k8seventsrecevier we should remove k8sobjects receiver from the following in edot:

- edot components: https://github.com/elastic/elastic-agent/blob/41feb796ea067072c2c11d23d139ea577f4eaaa6/internal/edot/components.yml#L34
- edot otel components: https://github.com/elastic/elastic-agent/blob/41feb796ea067072c2c11d23d139ea577f4eaaa6/internal/edot/otelcol/components.go#L28

cc @ChrsMark

Start with internal/edot/components.yml and internal/edot/otelcol/components.go at the linked locations, and inspect how k8sobjectsreceiver is listed in each. Remove the obsolete entries and search for remaining edot references to the receiver; done means both listed component definitions no longer include it without breaking validation.

Written by the indexing model from the issue text.