Add timeout for backup/restore expose

[Lyndon-Li]

For backup expose, the exposer waits for the snapshot to be ready, creates a volume from the snapshot and a pod to consume it and then Velero data mover waits for the pod to get to running status.
For restore expose, the exposer dynamically provisions a volume and a pod to consume it and then Velero data mover waits for the pod to get to running status.

It is possible that due to an unsatisfied condition, the volume creation from snapshot/volume dynamic creation hangs so the pod never gets to running status.
One example is that the information in the storage class is wrong, as a result, the volume dynamic creation never finishes.

For both backup expose and restore expose, if the above problem happens, the DataUpload/DataDownload will hang until a 4 hours timeout.

This PR adds a mechanism to track the time of the backup/restore expose and set a timeout value, if the timeout happens, the DataUpload/DataDownload will be marked as fail and any intermediate resources will be cleared.
At present, we set the timeout value as 30 min and is configurable by specifying a node-agent server parameter.

This PR can also fix the problem in a node-agent restart scenario. In the case that node-agent restarts while a backup exposer is waiting for the snapshot to be ready by the mean time, after node-agent restarts it doesn't know which DataUploads are affected, as a result, it cannot cancel them.
This mechanism can back node-agent server in this case -- any orphan DataUploads that node-agent server cannot cancel will fall into this timeout mechanism.

[codecov-commenter]

Codecov Report

Merging #6472 (bf2a981) into main (7deae4c) will increase coverage by 0.12%.
The diff coverage is 75.18%.

@@            Coverage Diff             @@
##             main    #6472      +/-   ##
==========================================
+ Coverage   60.18%   60.31%   +0.12%     
==========================================
  Files         229      229              
  Lines       24219    24319     +100     
==========================================
+ Hits        14577    14667      +90     
- Misses       8634     8647      +13     
+ Partials     1008     1005       -3     

Impacted Files	Coverage Δ
pkg/cmd/cli/nodeagent/server.go	11.20% <0.00%> (-0.10%)	⬇️
pkg/controller/data_upload_controller.go	69.12% <77.14%> (+2.98%)	⬆️
pkg/controller/data_download_controller.go	79.08% <80.32%> (+1.84%)	⬆️