UI: Always show the file browser for allocations and tasks.

[DingoEatingFuzz]

Before, we'd show a helpful error message when a task isn't running instead of erroring in a generic way. Turns out when an alloc is terminal but reachable, the filesystem is left behind and we were hiding it.

Now it is always shown and in the event that something errors, it'll either be generic, or--more commonly--a 404 of the allocation.

Fixes #9065

[github-actions]

Ember Asset Size action

As of 05f3bf2

Files that got Smaller 🎉:

File	raw	gzip
nomad-ui.js	-673 B	-111 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	05f3bf2	change
passes	1450	1448	-2
failures	0	0	0
flaky	0	0	0
duration	7m 45s 133ms	6m 56s 781ms	-48s 352ms

[backspace]

Seems like a nice improvement 🤩 I tried this locally and it worked as expected, though I wasn’t able to force an allocation 404, but I guess it would mean you can’t access the allocation route at all?

[DingoEatingFuzz]

Yeah, it wouldn't be navigable from elsewhere in the UI. The way I tested it was...

1. Run a job
2. Stop the allocation
3. Go to the file browser of the completed allocation
4. Run http PUT localhost:4646/v1/system/gc to remove the completed allocation
5. Refresh the file browser tab, receive 404.

[github-actions]

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