Change Version switch output to finish with a newline

[jrdodds]

Fixes #9482

Context

The -version switch doesn't terminate its output with a newline which some shells don't like.

Changes Made

• Added a unit test.
• Changed ShowVersion().

Testing

Tested on Windows 10 and macOS 14.
Tested by running the full unit test suite and by manually running the -version switch under cmd (Windows), pwsh (Windows and macOS), and zsh (macOS).

[baronfel]

Thank you!

[rainersigwald]

This could, conceivably, break someone who has a script that's calling msbuild -nologo -version | script_that_cant_handle_newline, right? I hate that I'm so conservative but I think I want it behind a changewave.

[jrdodds]

Yes, that's conceivable. And for someone who has written code like that and hits this change, the defect would be mysterious.

[jrdodds]

I think I should change the VersionSwitch unit test from a Theory to a Fact and just test one variant of the version switch. Covering multiple variants is somewhat redundant with CommandLineSwitchesTests.VersionSwitchIdentificationTests. (I started with the Help unit test as a model.)

[rainersigwald]

That sounds fine to me.

[jrdodds]

Should this be in a change wave and should it be change wave 17.10?

[rainersigwald]

Yes and yes, please.

[f-alizada]

Thank you for the PR!
I left one comment with question about the verification of two scenarios in one test, overall looks good :)

[f-alizada]

Thank you for the updates! Left one comment regarding the base branch to be merged