✨ refactor context for vspheredeploymentzone controller

[zhanggbj]

What this PR does / why we need it:

Refactor context for vspheredeploymentzone_controller.go and vspheredeploymentzone_controller_domain.go, as they are related, also refactor some underlying functions. Please find more background in #2295

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Part of #2295

[codecov]

Codecov Report

Patch coverage: 57.89% and project coverage change: -0.16% ⚠️

Comparison is base (09ff688) 60.97% compared to head (b65a713) 60.81%.
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2369      +/-   ##
==========================================
- Coverage   60.97%   60.81%   -0.16%     
==========================================
  Files         164      164              
  Lines        9465     9464       -1     
==========================================
- Hits         5771     5756      -15     
- Misses       3284     3294      +10     
- Partials      410      414       +4     

Files Changed	Coverage Δ
pkg/services/govmomi/cluster/service.go	78.57% <ø> (ø)
pkg/services/vimmachine.go	57.01% <7.31%> (ø)
...rollers/vspheredeploymentzone_controller_domain.go	50.73% <79.31%> (-8.09%)	⬇️
controllers/vspheredeploymentzone_controller.go	75.89% <86.66%> (-0.11%)	⬇️
pkg/services/govmomi/cluster/rule.go	58.06% <100.00%> (ø)
pkg/services/govmomi/cluster/vmgroup.go	85.00% <100.00%> (ø)
pkg/services/govmomi/metadata/metadata.go	75.51% <100.00%> (ø)
pkg/taggable/get.go	82.35% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[k8s-ci-robot]

@zhanggbj: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-vsphere-apidiff-main	b65a713	link	false	/test pull-cluster-api-provider-vsphere-apidiff-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[sbueringer]

Thank you!!

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ae182122a8ccac5274eadd1fe6ba29249facc210

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[chrischdi]

/lgtm