chore: moves workflow crd helper structs to this repo

[semmet95]

Changes

• adds shared Workflow CRD structs
• adds github workflow and makefile commands to ensure artifacts are updated to keep up with the changes

Summary by cubic

Centralizes workflow CRD helper structs under apis/oam/v1alpha1 and removes the kubevela/workflow dependency. Workflow types are now self-contained, simplifying maintenance and code generation.

• Refactors

  • Added local structs: InputItem, OutputItem, StepInputs/Outputs, WorkflowStepMeta, WorkflowStepBase, WorkflowStep, WorkflowSpec, WorkflowMode, WorkflowExecuteMode.
  • Updated Workflow to use local types and inline WorkflowSpec.
  • Regenerated deepcopy methods for new types.

• Dependencies

  • Removed github.com/kubevela/workflow v0.6.2 from go.mod/go.sum.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.64%. Comparing base (a91fd1f) to head (36bda23).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
- Coverage   86.71%   86.64%   -0.08%     
==========================================
  Files          82       82              
  Lines        4072     4072              
==========================================
- Hits         3531     3528       -3     
- Misses        408      410       +2     
- Partials      133      134       +1     

Flag	Coverage Δ
unit-test	86.64% <ø> (-0.08%)	⬇️

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[cubic-dev-ai]

No issues found across 4 files