Results 5 issues of Ray Chang

## What's the test to develop? Please describe Add test cases for #3444 to check whether the backup access mode is stored and the correctness of restore. ## Describe the...

kind/test

## Is your improvement request related to a feature? Please describe One of my longhorn nodes is not currently schedulable due to kubernetes nonsense, and this has broken the whole...

area/ui
kind/improvement
backport-needed/1.3.2
backport-needed/1.2.6

[Longhorn 4603](https://github.com/longhorn/longhorn/issues/4603) Signed-off-by: Ray Chang (cherry picked from commit 61ad5112c120cc049cd9a6af70cc76ceca585e41)

[Longhorn 4602](https://github.com/longhorn/longhorn/issues/4602) Signed-off-by: Ray Chang (cherry picked from commit 61ad5112c120cc049cd9a6af70cc76ceca585e41)

[Longhorn 4601](https://github.com/longhorn/longhorn/issues/4601) Signed-off-by: Ray Chang