Breve-rest corrections

[mike-spa]

Resolves: #25246
Resolves: #25294

This is a stripped down version of #25295.

[rpatters1]

I think you should include more of the visual tests I added in #25295. In particular, there are currently no visual tests for when Sid::multiVoiceRestTwoSpaceOffset is true. Without such tests, we could be changing the rest behavior without any idea that we are doing so. I created b versions of some of the rest tests for that are identical to their counterparts except the 2-space offset style is true. I don't care what naming convention we use, but here are the ones I added:

• rest-02b.mscz
• rest-09b.mscz

In addition, I added rest-10.mscz and rest-10b.mscz to test floating full measure rests inside the staff for both styles. Of all the tests I added, perhaps these could be omitted. But there are no other tests for fullmeasure rests among the rest- tests.

Ultimately, because there have until now been no regression tests for when Sid::multiVoiceRestTwoSpaceOffset is true, I am uncertain if the current behavior is by design and/or even desirable. To me it seems like the rests float way too far outside the staff. But whatever the answer is, I think tests should be added so that if the behavior changes, we'll know it.

[rpatters1]

In my version of this PR, I changed the name from computeWholeRestOffset to computeWholeOrBreveRestOffset, to reflect what its new function is.