Add flag leaf data for Temora

[hut104]

working on #10516

[hut104]

@par456 and @ric394
The change simply adds three observations to a single experience in the GxExM test set.
The stats are different because N has increased by 3 and the new data are added to show that the final leaf number was lower than predicted (therefore the goodness of fit is reduced).
A following PR will show changes to the parameterisation to address this.
I suggest merging this change if you agree.

[ric394]

@APSIMInitiative/reference-panel

This PR adds 3 additional observations to a single GxExM datasets.

The issue has been documented #10516

The file changes are here.

The changes in stats can be found here.

As this PR is only adding data it will be merged today. Please comment if there is an issue.