UI: Filter out new records from the job list page

[DingoEatingFuzz]

When a prefix is set and the run job button is clicked, the new job would cause an error because it has no name yet.

Closes #7032

[github-actions]

Ember Asset Size action

As of 8c3d514

Files that got Bigger 🚨:

File	raw	gzip
nomad-ui.js	+38 B	+12 B

Files that stayed the same size 🤷‍:

File	raw	gzip
vendor.js	0 B	0 B
nomad-ui.css	0 B	0 B
vendor.css	0 B	0 B

[github-actions]

Ember Test Audit comparison

	master	8c3d514	change
passes	1288	1289	+1
failures	0	0	0
flaky	0	0	0
duration	6m 00s 762ms	6m 21s 652ms	+20s 890ms

[backspace]

I used to think it was exciting that new records were automatically part of collections and now I’m usually annoyed that I always have to filter them out 😆 nice simple intervention and accompanying test though 😀

[github-actions]

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