[8.x](backport #40766) [Metricbeat][vSphere] New metrics support and minor changes to existing metricsets

[mergify]

• Enhancement

vSphere

Datastore

• Updated metrics collected using Performance API for better coverage of data.
• Added support for available metrics check to avoid unnecessary issues of PerfMetrics API

Host

• Added support for available metrics check to avoid unnecessary issues of PerfMetrics API

Virtual Machine

• Fix Virtual Machine container view creation by adding support for snapshot.
• Fix object type event over snapshot array of objects.

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.

Related issues

---

This is an automatic backport of pull request #40766 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 3f44bd1 has failed:

On branch mergify/bp/8.x/pr-40766
Your branch is up to date with 'origin/8.x'.

You are currently cherry-picking commit 3f44bd1f9b.
  (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:   CHANGELOG.next.asciidoc
	modified:   metricbeat/docs/fields.asciidoc
	modified:   metricbeat/module/vsphere/datastore/_meta/fields.yml
	modified:   metricbeat/module/vsphere/datastore/data.go
	modified:   metricbeat/module/vsphere/datastore/data_test.go
	modified:   metricbeat/module/vsphere/datastore/datastore_test.go
	modified:   metricbeat/module/vsphere/virtualmachine/_meta/fields.yml

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   metricbeat/module/vsphere/datastore/_meta/data.json
	both modified:   metricbeat/module/vsphere/datastore/datastore.go
	both modified:   metricbeat/module/vsphere/fields.go
	both modified:   metricbeat/module/vsphere/host/_meta/data.json
	both modified:   metricbeat/module/vsphere/host/host.go
	both modified:   metricbeat/module/vsphere/virtualmachine/_meta/data.json
	both modified:   metricbeat/module/vsphere/virtualmachine/data_test.go
	both modified:   metricbeat/module/vsphere/virtualmachine/virtualmachine.go

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

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.x/pr-40766 upstream/mergify/bp/8.x/pr-40766
git merge upstream/8.x
git push upstream mergify/bp/8.x/pr-40766

[mergify]

This pull request has not been merged yet. Could you please review and merge it @kush-elastic? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @kush-elastic? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @kush-elastic? 🙏

[niraj-elastic]

LGTM