Feat: migrate prism cluster

[Somefive]

Description of your changes

Migrate prism cluster to cluster-gateway to decouple kubevela/prism from this main repo.

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 70.58% and project coverage change: -0.13 ⚠️

Comparison is base (c007ad8) 61.64% compared to head (4225261) 61.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5836      +/-   ##
==========================================
- Coverage   61.64%   61.52%   -0.13%     
==========================================
  Files         223      223              
  Lines       30977    30979       +2     
==========================================
- Hits        19096    19059      -37     
- Misses      10122    10155      +33     
- Partials     1759     1765       +6     

Flag	Coverage Δ
core-unittests	55.83% <31.25%> (+<0.01%)	⬆️
e2e-multicluster-test	25.32% <58.82%> (-0.30%)	⬇️
e2e-rollout-tests	21.61% <26.66%> (-0.02%)	⬇️
e2etests	27.32% <33.33%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cmd/completion.go	0.00% <0.00%> (ø)
pkg/multicluster/utils.go	60.22% <ø> (-0.45%)	⬇️
pkg/utils/common/common.go	59.06% <ø> (-0.14%)	⬇️
pkg/multicluster/cluster_management.go	35.62% <42.85%> (-2.74%)	⬇️
pkg/addon/addon.go	58.80% <100.00%> (ø)
pkg/multicluster/virtual_cluster.go	78.67% <100.00%> (-0.59%)	⬇️
pkg/policy/topology.go	90.62% <100.00%> (ø)

... and 8 files with indirect coverage changes

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