[DocsUI M3] Fix breadcrumb display issue with large display size

* Use wrap_content instead of hard-coded height for breadcrumb
  item to make it show full text even in large display size.
* Make breadcrumb row itself not focusable to prevent the
  unnecessary grey background.

Check the attached bug for the demo.

Bug: 414262009
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I6b4161f817bf1eb5644304611583292ca80b4bf3