Feat: set multicluster enabled by default

[Somefive]

Signed-off-by: Yin Da yd219913@alibaba-inc.com

Description of your changes

Set multi-cluster as enabled by default in kubevela chart.
NOTE: minimal chart still keep it disabled by default

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

Merging #2930 (7148edf) into master (4dc2134) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2930   +/-   ##
=======================================
  Coverage   59.81%   59.82%           
=======================================
  Files         239      239           
  Lines       24280    24280           
=======================================
+ Hits        14524    14525    +1     
+ Misses       8007     8003    -4     
- Partials     1749     1752    +3     

Flag	Coverage Δ
apiserver-unittests	27.44% <ø> (+0.03%)	⬆️
core-unittests	47.04% <ø> (+0.01%)	⬆️
e2e-multicluster-test	24.90% <ø> (ø)
e2e-rollout-tests	28.83% <ø> (+0.18%)	⬆️
e2etests	37.66% <ø> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
apis/core.oam.dev/v1beta1/policy_definition.go	0.00% <0.00%> (-50.00%)	⬇️
...aits/traitdefinition/traitdefinition_controller.go	63.15% <0.00%> (-9.48%)	⬇️
...g/controller/core.oam.dev/v1alpha2/core/revison.go	71.73% <0.00%> (-2.18%)	⬇️
...ntroller/common/rollout/rollout_plan_controller.go	60.51% <0.00%> (-1.54%)	⬇️
...am.dev/v1alpha2/applicationconfiguration/render.go	87.39% <0.00%> (-0.82%)	⬇️
...es/policydefinition/policydefinition_controller.go	66.66% <0.00%> (ø)
pkg/oam/util/helper.go	76.09% <0.00%> (+0.48%)	⬆️
...ller/core.oam.dev/v1alpha2/application/revision.go	74.90% <0.00%> (+0.98%)	⬆️
...dev/v1alpha2/application/application_controller.go	77.69% <0.00%> (+3.07%)	⬆️
pkg/apiserver/rest/utils/bcode/bcode.go	46.66% <0.00%> (+3.33%)	⬆️
... and 2 more

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[wonderflow]

Cool