local-exec unit tests and e2e tests

[szaher]

create unit and e2e tests for the local-exec backend.

[andreyvelich]

/area testing
/area local

[Yadavanurag13]

@szaher @andreyvelich I would like to pick this issue.
Need to provide test coverage to /backend/localprocess if I'm not wrong.

[andreyvelich]

Sure, sound great! @szaher has already done some the progress here: #96
@Yadavanurag13 So please feel free to take this over and complete the PR.
/assign @Yadavanurag13

[andreyvelich]

This is complete by #91
/close

[google-oss-prow]

@andreyvelich: Closing this issue.

In response to this:

This is complete by #91
/close

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