[9.5](backport #8447) refactor: update autodiscover dependency

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Summary of your changes

Replaces the Go module github.com/elastic/elastic-agent-autodiscover with packages from github.com/elastic/beats/v7/pkg/autodiscover. This is following the move of the elastic-agent-autodiscover code to Beats (elastic/beats#51804).

This is a dependency replacement without functional changes.

Checklist

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added the necessary README/documentation (if appropriate)

---

This is an automatic backport of pull request #8447 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 4e57a07 has failed:

On branch mergify/bp/9.5/pr-8447
Your branch is up to date with 'origin/9.5'.

You are currently cherry-picking commit 4e57a07.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   NOTICE.txt
	modified:   go.mod
	modified:   internal/dataprovider/providers/k8s/client_provider.go
	modified:   internal/dataprovider/providers/k8s/client_provider_mock.go
	modified:   internal/dataprovider/providers/k8s/cluster_name_provider.go
	modified:   internal/flavors/benchmark/eks.go
	modified:   internal/flavors/benchmark/k8s.go
	modified:   internal/flavors/benchmark/k8s_helper.go
	modified:   internal/processor/add_cluster_id/add_cluster_id.go
	modified:   internal/resources/fetching/fetchers/aws/ecr_fetcher_test.go
	modified:   internal/resources/fetching/fetchers/k8s/kube_fetcher.go
	modified:   internal/resources/fetching/fetchers/k8s/kube_provider.go
	modified:   internal/uniqueness/leaderelection.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.sum

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