ui: set namespace when looking for and displaying children jobs

[lgfa29]

When setting the watcher for child jobs, the watcher was not setting the namespace value. This would cause periodic or parameterized jobs in a non-default namespace to query for the wrong child jobs.

Additionally, the Job Launches table was missing the possibility that the job namespace would be displayed in the table row, causing a mismatch between the number of th and td tags in the table.

Closes #10906

[github-actions]

Ember Asset Size action

As of 87ef270

Files that got Bigger 🚨:

File	raw	gzip
nomad-ui.js	+461 B	+41 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

	main	87ef270	change
passes	1107	1123	+16
failures	0	0	0
flaky	0	0	0
duration	8m 55s 356ms	9m 28s 893ms	+33s 537ms

[github-actions]

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