feat(sdk): Local runner supports additional docker options. Fixes #6598

[lynnmatrix]

Description of your changes:
Fix #6598

Pass additional docker options to local runner through ExecutionMode, e.g.:

run_pipeline_func_locally(
    _pipeline,
    {},
    execution_mode=LocalClient.ExecutionMode(mode="docker",
                                            docker_options=["-e", "foo=bar"])
)

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[chensun]

@lynnmatrix Thanks for the PR. Can you please add an entry in the release note under "Current version > bug fixes and other changes"?
https://github.com/kubeflow/pipelines/blob/master/sdk/RELEASE.md

[chensun]

/lgtm
/approve

Thanks!

[google-oss-robot]

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