Handle multiple flow files in test command

[tokou]

Proposed changes

• I opted for a space separated list as it's an argument and not an option
• I only affected test command and tried to have no effect on other commands

Testing

• Added test cases in WorkspaceExecutionPlanner

Issues fixed

Fixes #1990

[bartekpacia]

Thanks, this looks nice!

I'm curious if tab-completion works when the user wants to pass a few space-delimeted yaml files?

[tokou]

Yes it works

[bartekpacia]

Looks like test failed because [email protected] was entered instead of [email protected].

Weird issue, I assume it's some random flakiness. I skimmed over existing bugs but didn't find an existing issue for it.

Action taken:

• rerun the test
• report as inputText sometimes repeats individual characters #2005

[bartekpacia]

@tokou there's a problem now because of withDefaultShellEnv, after we've merged #1945

[bartekpacia]

LGTM, thanks!