@JsonIgnore causes emulator endpoint to be missing in DoFn's

[kberezin-nshl]

Unfortunately, BigQueryIO continues to refer to pipeline option post graph construction time, for example during @FinishBundle in UpdateSchemaDestination, and @JsonIgnore prevents endpoint URL to be serialized, and the whole thing doesn't work. This fixes that.

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[kberezin-nshl]

assign set of reviewers

[kberezin-nshl]

Looks like the build failure is a flake.

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[Abacn]

thanks! rerun the failed test and will merge after it pass

[kberezin-nshl]

retest this please