Backport of [ui] Helios and Power Select upgrades into release/1.8.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #22328 to be assessed for backporting due to the inclusion of the label backport/1.8.x.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@philrenaud
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/nomad/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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• Upgrading Helios to 4.3.0
• ember-element-helper was previously pinned because of an old version of ember-power-select, which is now also upgraded, so pin removed.

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Overview of commits

• e09b291

[hashicorp-cla-app]

All committers have signed the CLA.

[github-actions]

Ember Test Audit comparison

	release/1.8.x	32b5593	change
passes	1564	1564	0
failures	0	0	0
flaky	0	0	0
duration	11m 35s 034ms	11m 32s 328ms	-02s 706ms