Fix: input error stores structure type data

[yangsoon]

Description of your changes

In the following example, if response.data is a struct that contains multiple fields, the if statement will parse incorrectly.
this PR fix this bug.

response: data: {
 success: true
 code: 200
}

- name: test-step
  subSteps:
  - name: test-subStep-1
    outputs:
    - name: subStep-1-result
      valueFrom: response.data
    type: webhook
  # cue parse error 
  - if:  inputs["subStep-1-result"].success == true
    inputs:
    - from: subStep-1-result
    name: test-subStep-2
    type: webhook

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: 67.79% // Head: 24.20% // Decreases project coverage by -43.59% ⚠️

Coverage data is based on head (a4ae694) compared to base (3f1eab6).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #91       +/-   ##
===========================================
- Coverage   67.79%   24.20%   -43.60%     
===========================================
  Files          45       41        -4     
  Lines        4065     3735      -330     
===========================================
- Hits         2756      904     -1852     
- Misses        947     2619     +1672     
+ Partials      362      212      -150     

Flag	Coverage Δ
e2etests	24.20% <0.00%> (ø)
unit-test	?

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

Impacted Files	Coverage Δ
pkg/tasks/custom/task.go	34.62% <0.00%> (-36.72%)	⬇️
pkg/backup/interface.go	0.00% <0.00%> (-83.34%)	⬇️
api/condition/condition.go	10.38% <0.00%> (-81.82%)	⬇️
pkg/cue/model/instance.go	0.00% <0.00%> (-75.00%)	⬇️
pkg/cue/model/sets/operation.go	0.00% <0.00%> (-74.39%)	⬇️
pkg/providers/email/send.go	7.01% <0.00%> (-73.69%)	⬇️
pkg/cue/utils.go	0.00% <0.00%> (-71.88%)	⬇️
pkg/providers/http/ratelimiter/ratelimiter.go	30.00% <0.00%> (-70.00%)	⬇️
pkg/tasks/builtin/step_group.go	0.00% <0.00%> (-68.82%)	⬇️
pkg/debug/context.go	0.00% <0.00%> (-66.67%)	⬇️
... and 27 more

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