[9.1](backport #45376) chore: replace deprecated mitchellh dependencies

[mergify]

Proposed commit message

This PR replaces deprecated mitchellh dependencies.

• github.com/mitchellh/mapstructure migrated to github.com/go-viper/mapstructure/v2
• github.com/mitchellh/hashstructure migrated to github.com/gohugoio/hashstructure

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test

$ rg mitchellh go.mod
105:    github.com/mitchellh/gox v1.0.1
376:    github.com/mitchellh/copystructure v1.2.0 // indirect
377:    github.com/mitchellh/go-homedir v1.1.0 // indirect
378:    github.com/mitchellh/iochan v1.0.0 // indirect
379:    github.com/mitchellh/mapstructure v1.5.0 // indirect
380:    github.com/mitchellh/reflectwalk v1.0.2 // indirect

Gox is the only remaining direct dependency, but it has no blessed fork and is a tool. Turns out we don't need gox, it will be removed in #45555.

Related issues

• Closes https://github.com/elastic/ingest-dev/issues/2801

---

This is an automatic backport of pull request #45376 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 8d8fd70 has failed:

On branch mergify/bp/9.1/pr-45376
Your branch is up to date with 'origin/9.1'.

You are currently cherry-picking commit 8d8fd702e.
  (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:   dev-tools/mage/pkgtypes.go
	modified:   filebeat/beater/crawler.go
	modified:   filebeat/fileset/factory.go
	modified:   filebeat/input/file/identifier.go
	modified:   filebeat/input/v2/compat/compat.go
	modified:   go.sum
	modified:   heartbeat/monitors/monitor.go
	modified:   heartbeat/monitors/wrappers/wrappers.go
	modified:   libbeat/cfgfile/glob_watcher.go
	modified:   libbeat/cfgfile/list.go
	modified:   libbeat/otelbeat/oteltranslate/outputs/elasticsearch/config_otel.go
	modified:   libbeat/otelbeat/oteltranslate/tls_otel.go
	modified:   libbeat/processors/ratelimit/rate_limit.go
	modified:   libbeat/processors/timeseries/timeseries.go
	modified:   libbeat/processors/timeseries/timeseries_test.go
	modified:   metricbeat/beater/metricbeat.go
	modified:   metricbeat/helper/prometheus/ptest/ptest.go
	modified:   metricbeat/mb/testing/testdata.go
	modified:   metricbeat/module/haproxy/haproxy.go
	modified:   metricbeat/module/kubernetes/kubernetes.go
	modified:   metricbeat/module/system/service/service.go
	modified:   packetbeat/beater/processor.go
	modified:   x-pack/dockerlogbeat/pipelinemanager/pipelineManager.go
	modified:   x-pack/filebeat/input/gcppubsub/input.go
	modified:   x-pack/libbeat/common/otelbeat/status/runner.go
	modified:   x-pack/metricbeat/module/containerd/containerd.go

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

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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