PWX-34271: live migrate KubeVirt VMs before PX upgrade

[pureneelesh]

What this PR does / why we need it:

In order to avoid downtime for KubeVirt VMs, the operator live-migrates the VMs before deleting the PX pod during an upgrade.

NoSchedule taint is added to the nodes before the VM live-migration to prevent any other VMs from landing on those nodes. Taint is removed once the node is upgraded. Added toleration for this taint to the PX pods.

We ignore the VMs that are not live migratable. If VM eviction fails, the node upgrade is blocked and an event is generated.

Which issue(s) this PR fixes (optional) PWX-34271

Special notes for your reviewer:

[pp511]

Need to take a look at the test code. Will do it in another pass.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.47059% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 80.28%. Comparing base (493a1d8) to head (15875ac).

Files	Patch %	Lines
pkg/controller/storagecluster/update.go	68.93%	21 Missing and 11 partials :warning:
pkg/controller/storagecluster/kubevirt.go	88.88%	7 Missing and 3 partials :warning:
pkg/controller/storagecluster/util.go	40.00%	6 Missing :warning:

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-24.1.0    #1533      +/-   ##
==================================================
- Coverage           80.32%   80.28%   -0.05%     
==================================================
  Files                  60       61       +1     
  Lines               17857    18051     +194     
==================================================
+ Hits                14344    14492     +148     
- Misses               2525     2557      +32     
- Partials              988     1002      +14     

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