fix(sdk): fix deserializing v1 component yaml defaults

[connor-mccarthy]

Description of your changes:
Fixes two errors related to handling of v1 component YAML defaults:

• Boolean types with defaults as strings (e.g., "True"/"true"/"False"/"false") could be loaded in, but could not be compiled.
• Struct/Array types were loaded in, but not compiled correctly (compiled as a google.protobuf.Value.string_value instead of google.protobuf.Value.struct_value and google.protobuf.Value.list_value, respectively.

This PR fixes both and relocates all v1 component YAML default handling logic to the v1 component YAML deserialization code from v2 IR YAML compilation code.

Checklist:

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[google-oss-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[connor-mccarthy]

/assign @chensun

[google-oss-prow]

@connor-mccarthy: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
kubeflow-pipelines-sdk-execution-tests	0fa28ed	link	true	/test kubeflow-pipelines-sdk-execution-tests

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[chensun]

/lgtm
/approve

Thanks!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

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[connor-mccarthy]

kubeflow-pipelines-sdk-execution-tests failures are unrelated to this PR. Manually merging.