Backport of [ui] Rework of node/job attributes/meta using PathTree into release/1.8.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #23290 to be assessed for backporting due to the inclusion of the label backport/1.8.x.

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

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This extends and reuses PathTree logic originally written for Variables in #13202

This PR specifically fixes a bug where a metadata k/v item wouldn't show up in the UI if its full key was the prefix of a nested child key.

For example, this metadata:

{
  'phil.hair': 'yes',
  'phil.hair.colour': 'black',
  'phil.hair.length': 'short'
};

would produce the following:

and now produces:

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Overview of commits

• d349434

[github-actions]

Ember Test Audit comparison

	release/1.8.x	5084269	change
passes	1564	1563	-1
failures	0	0	0
flaky	0	0	0
duration	11m 45s 101ms	11m 37s 172ms	-07s 929ms

[github-actions]

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