Feat: need podAntiAffinity for vela pods, in order to make kubevela h…

[StevenLeiZhang]

…igh availability

Signed-off-by: StevenLeiZhang zhangleiic@163.com

Description of your changes

Fixes #5425

1. add default podAntiAffinity for vela-core and vela-cluster-gateway
2. if user customize affinity in helm's values file, use user's content. if not, use default affinity.

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

Base: 61.22% // Head: 61.21% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (037d973) compared to base (c2de316).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5465      +/-   ##
==========================================
- Coverage   61.22%   61.21%   -0.01%     
==========================================
  Files         310      310              
  Lines       47160    47160              
==========================================
- Hits        28875    28871       -4     
  Misses      15291    15291              
- Partials     2994     2998       +4     

Flag	Coverage Δ
apiserver-e2etests	35.68% <ø> (+0.11%)	⬆️
apiserver-unittests	36.25% <ø> (ø)
core-unittests	55.27% <ø> (+0.01%)	⬆️
e2e-multicluster-test	19.06% <ø> (-0.03%)	⬇️
e2e-rollout-tests	20.74% <ø> (+0.02%)	⬆️
e2etests	25.72% <ø> (-0.44%)	⬇️

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

Impacted Files	Coverage Δ
.../core/scopes/healthscope/healthscope_controller.go	57.89% <0.00%> (-14.92%)	⬇️
...dev/v1alpha2/application/application_controller.go	83.25% <0.00%> (-3.03%)	⬇️
pkg/controller/utils/capability.go	80.07% <0.00%> (-1.71%)	⬇️
pkg/addon/push.go	75.14% <0.00%> (-1.13%)	⬇️
...ller/core.oam.dev/v1alpha2/application/revision.go	70.87% <0.00%> (-0.91%)	⬇️
pkg/apiserver/domain/service/application.go	58.43% <0.00%> (+0.18%)	⬆️
pkg/addon/addon.go	63.62% <0.00%> (+0.28%)	⬆️
...ler/core.oam.dev/v1alpha2/application/generator.go	88.14% <0.00%> (+0.80%)	⬆️
...server/infrastructure/datastore/kubeapi/kubeapi.go	64.86% <0.00%> (+1.08%)	⬆️
pkg/cue/definition/template.go	68.24% <0.00%> (+1.48%)	⬆️
... and 9 more

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