ui: Ensure <OperationLogs> reacts correctly when @jobId updates

[jgwhite]

Why the change?

Closes #2855

What’s the plan?

• Figure out how to get current text from an xterm.js instance
• Write a test for <OperationLogs>
• Make the test pass
• Make the xterm.js helper work on Linux (i.e. in CI)

What does it look like?

Before

CleanShot.2022-01-13.at.23.16.12.mp4

After

CleanShot.2022-01-13.at.23.14.47.mp4

How do I test it?

1. Check out the branch git checkout ui/operation-logs-attr-change
2. Boot the dev server against a waypoint server
3. Try navigating between deployments
4. Verify that the logs are correctly refreshed

[github-actions]

Ember Asset Size action

As of 6c6479f

Files that got Bigger 🚨:

File	raw	gzip
waypoint.js	+612 B	+160 B

Files that stayed the same size 🤷‍:

File	raw	gzip
vendor.js	0 B	0 B
vendor.css	0 B	0 B
waypoint.css	0 B	0 B

[jgwhite]

@gregone you’ll see that for the getTerminalText helper I used a very literal-minded approach of simulating “select all”, then “copy”, then returning the resultant clipboard data. However, it looks like xterm.js only recognizes the Mac shortcut for select all (cmd+a) and doesn’t have anything special for Windows and Linux. I hope I’m wrong about this, but if not we might need a slightly different approach.