fix(sdk.v2): Fix InputPathPlaceholder changed to InputValuePlaceholder

[chensun]

Description of your changes:
Prior to this fix, if you print the value before and after this line:

pipelines/sdk/python/kfp/v2/components/experimental/structures.py

Line 446 in 98677b2

container_spec = ContainerSpec.parse_obj(implementation)

for example:

print('before: ', implementation)
container_spec = ContainerSpec.parse_obj(implementation)
print('after: ', container_spec)

Then run this unit test:

pipelines/sdk/python/kfp/v2/components/experimental/structures_test.py

Line 363 in 98677b2

def test_component_spec_load_from_v1_component_yaml(self):

You'll see that the InputPathPlaceholder(input_name='Input artifact') in implementation changed to InputValuePlaceholder(input_name='Input artifact') in container_spec.

This is caused by the pydantic issue: pydantic/pydantic#2079

Checklist:

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[chensun]

As a follow up action item, we need to investigate why the unit test couldn't catch this.

pipelines/sdk/python/kfp/v2/components/experimental/structures_test.py

Line 363 in 98677b2

def test_component_spec_load_from_v1_component_yaml(self):

/cc @ji-yaqi

[chensun]

/test kubeflow-pipelines-samples-v2

[chensun]

/test kubeflow-pipelines-samples-v2

[ji-yaqi]

/test kubeflow-pipelines-samples-v2

[ji-yaqi]

/lgtm
/approve
Thanks @chensun for the fix! Will look into the unit test issue.

[google-oss-robot]

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