Remove cops and rops pipeline attributes

[elikatsis]

• Remove the separated dictionaries for ContainerOps and ResourceOps
• Fix the sanitization performed by the compiler to iterate through ops
  dict and do type-check for the special fields file_outputs and
  attribute_outputs

I found a bug which has to do with PipelineParam hashing.
__hash__ method of PipelineParam now uses pattern attribute too.
If a PipelineParam was found twice in an Op, e.g. in arguments and in volumes, having different patterns messed the inputs attribute (which uses set() on the extracted PipelineParams).
I will open a separate PR for this.

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This change is 

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @elikatsis. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Ark-kun]

/lgtm

[Ark-kun]

/approve

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Ark-kun

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