Feat: Add startup probe trait

[jguionnet]

Signed-off-by: Jerome Guionnet jguionnet@guidewire.com

Description of your changes

Feat: Add startup probe trait

See #5092

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

Using the usage example provided with the PR

[codecov]

Codecov Report

Base: 49.43% // Head: 61.20% // Increases project coverage by +11.76% 🎉

Coverage data is based on head (345168e) compared to base (c89f268).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5093       +/-   ##
===========================================
+ Coverage   49.43%   61.20%   +11.76%     
===========================================
  Files         304      306        +2     
  Lines       33264    45349    +12085     
===========================================
+ Hits        16444    27755    +11311     
- Misses      14548    14759      +211     
- Partials     2272     2835      +563     

Flag	Coverage Δ
apiserver-e2etests	35.11% <ø> (?)
apiserver-unittests	36.93% <ø> (-0.23%)	⬇️
core-unittests	55.08% <ø> (-0.13%)	⬇️
e2e-multicluster-test	18.91% <ø> (+0.27%)	⬆️
e2e-rollout-tests	20.51% <ø> (+0.32%)	⬆️
e2etests	25.99% <ø> (+0.30%)	⬆️

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

Impacted Files	Coverage Δ
cmd/core/main.go	0.00% <0.00%> (-10.51%)	⬇️
pkg/resourcekeeper/resourcekeeper.go	67.27% <0.00%> (-8.49%)	⬇️
pkg/velaql/context.go	27.90% <0.00%> (-6.88%)	⬇️
pkg/resourcekeeper/componentrevision.go	58.33% <0.00%> (-5.96%)	⬇️
pkg/utils/util/cmd.go	20.00% <0.00%> (-5.00%)	⬇️
pkg/auth/round_trippers.go	81.81% <0.00%> (-4.85%)	⬇️
pkg/stdlib/packages.go	57.14% <0.00%> (-4.40%)	⬇️
pkg/config/writer/nacos.go	64.70% <0.00%> (-4.37%)	⬇️
pkg/cue/task/process.go	35.71% <0.00%> (-4.29%)	⬇️
pkg/utils/load.go	48.78% <0.00%> (-4.17%)	⬇️
... and 299 more

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[Somefive]

Here we usually use //+patchKey=name, or use [{}, ...]. The [...{}] for patch means the startupProbe will be patched to all containers.

[wonderflow]

please add the example here align the format: https://github.com/kubevela/kubevela/tree/master/references/docgen/def-doc/trait

They'll be generated as reference doc automatically. https://kubevela.net/docs/end-user/traits/references

[wonderflow]

good job