feat(sdk): support f-strings in local pipeline execution #localexecution

[connor-mccarthy]

Description of your changes:
Support f-strings in local pipeline execution.

from kfp import dsl
from kfp import local

local.init(runner=local.SubprocessRunner())

@dsl.component
def identity(string: str) -> str:
    return string

@dsl.pipeline
def my_pipeline(string: str = 'baz') -> str:
    op1 = identity(string=f'bar-{string}')
    op2 = identity(string=f'foo-{op1.output}')
    return op2.output

task = my_pipeline()
assert task.output == 'foo-bar-baz'

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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

[connor-mccarthy]

/retest

[connor-mccarthy]

/retest

[chensun]

/lgtm
/approve

[google-oss-prow]

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