Fix Undeclared in Pharo 13

[demarey]

Because of recent changes in Pharo 13, Smalltalk CI fails because it uses a class that has been renamed.
The fix is to add this method in SmalltalkCIPharo13:

imageInfo
	^ String streamContents: [ :stream | StSystemReporterPresenter new reportImage: stream ]

I did a PR but metadata writing from Pharo is not the same as in Squeak and there was a lot of noise.
Tell me if you prefer the PR with metadata noise or if this issue is enough.

[fniephaus]

Hi @demarey, a PR would be nice. Maybe create it manually but adding a file for the method and adding it to the corresponding properties file?

[fniephaus]

cc @theseion

[demarey]

done in #649

[theseion]

Fixed by #646