3a/ Improve logging around transitions

- Extend transitTypeToString() for custom transition types
- Add missing HOP strings
- Add additional clarifying comments along the transient launch paths
- Remove unnecessary minWidth/Height logs if they have default values

Bug: 346588978
Flag: EXEMPT logs/comments changes
Test: Build SystemUI & Launcher
Change-Id: I97f0d1b913e37e89eb0bee2e2b32bf06b333b3ed
Signed-off-by: Winson Chung <winsonc@google.com>