Fix: enhance the canary rollout setting

[barnettZQG]

Description of your changes

1. Support guiding to create the canary rollout workflow. Users could select a workflow to deploy the application.
2. Support adding the sub-step after any existing step.
3. Set the canary-deploy step mode is StepByStep.

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 yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

/cc @wangyikewxgm

[codecov]

Codecov Report

Patch coverage: 29.16% and project coverage change: -0.04 ⚠️

Comparison is base (3656e04) 61.02% compared to head (a152264) 60.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #752      +/-   ##
==========================================
- Coverage   61.02%   60.98%   -0.04%     
==========================================
  Files         106      106              
  Lines       18869    18887      +18     
==========================================
+ Hits        11515    11519       +4     
- Misses       5936     5949      +13     
- Partials     1418     1419       +1     

Flag	Coverage Δ
apiserver-unittests	33.71% <13.63%> (+0.01%)	⬆️
server-e2e-tests	49.88% <16.66%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
pkg/server/interfaces/api/dto/v1/types.go	73.33% <ø> (ø)
pkg/server/interfaces/api/validate.go	51.56% <0.00%> (-10.71%)	⬇️
pkg/server/domain/service/application.go	61.92% <37.50%> (-0.07%)	⬇️
pkg/server/interfaces/api/application.go	60.67% <66.66%> (ø)
pkg/server/interfaces/api/assembler/v1/do2dto.go	87.59% <100.00%> (+0.04%)	⬆️
pkg/server/interfaces/api/assembler/v1/dto2do.go	87.75% <100.00%> (+0.25%)	⬆️

... and 7 files with indirect coverage changes

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