Fix: keep the workflow data structure in MongoDB

[barnettZQG]

Signed-off-by: barnettZQG barnett.zqg@gmail.com

Description of your changes

Fixes #5137

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: 61.21% // Head: 61.15% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (035d668) compared to base (360c9e2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5276      +/-   ##
==========================================
- Coverage   61.21%   61.15%   -0.07%     
==========================================
  Files         307      307              
  Lines       46350    46350              
==========================================
- Hits        28375    28347      -28     
- Misses      15063    15079      +16     
- Partials     2912     2924      +12     

Flag	Coverage Δ
apiserver-e2etests	35.56% <ø> (-0.03%)	⬇️
apiserver-unittests	36.30% <ø> (ø)
core-unittests	55.17% <ø> (-0.03%)	⬇️
e2e-multicluster-test	19.01% <ø> (+0.02%)	⬆️
e2e-rollout-tests	20.66% <ø> (?)
e2etests	26.13% <ø> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
pkg/apiserver/domain/model/workflow.go	100.00% <ø> (ø)
pkg/addon/registry.go	38.65% <0.00%> (-12.61%)	⬇️
pkg/apiserver/event/sync/cr2ux.go	51.16% <0.00%> (-9.31%)	⬇️
...es/policydefinition/policydefinition_controller.go	69.51% <0.00%> (-7.32%)	⬇️
...aits/traitdefinition/traitdefinition_controller.go	69.41% <0.00%> (-7.06%)	⬇️
pkg/apiserver/domain/service/target.go	57.86% <0.00%> (-3.38%)	⬇️
pkg/apiserver/event/sync/store.go	71.49% <0.00%> (-1.36%)	⬇️
pkg/auth/privileges.go	66.09% <0.00%> (-0.86%)	⬇️
...server/infrastructure/datastore/kubeapi/kubeapi.go	63.71% <0.00%> (-0.84%)	⬇️
...ller/core.oam.dev/v1alpha2/application/revision.go	71.22% <0.00%> (-0.52%)	⬇️
... and 8 more

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[github-actions]

Successfully created backport PR #5283 for release-1.6.