[jsonpickle]: Move Fuzz Harness & Configuration Upstream

[DaveLak]

[!NOTE] This should remain a draft until the project.yaml auto CC list is finalized and the upstream PR is accepted.

The jsonpickle project maintainers would like to take ownership of the OSS-Fuzz integration & test harnesses.

Discussion related to the decision can be found here: https://github.com/jsonpickle/jsonpickle/issues/496

[github-actions[bot]]

DaveLak is a new contributor to projects/jsonpickle. The PR must be approved by known contributors before it can be merged.

[davvid]

Upstream has merged https://github.com/jsonpickle/jsonpickle/pull/525

[DaveLak]

@DavidKorczynski does this look good to you?