[AIRFLOW-5304] Fix extra links in BigQueryOperator with multiple queries

[mik-laj]

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CC: @milton0825

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Code Quality

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[milton0825]

nit: Can we extract this string to a template and reuse it in line 44?

[mik-laj]

Updated. :-D

[milton0825]

LGTM apart from a small nit. I am glad people are using the extra link feature 😄

[mik-laj]

I would like GCP operators to better support these feature. I hope that we will be able to find hours in the near future to add support for this. I hope to find hours in the near future to add support for this feature to more operators. I am currently working on one set of operators and It will implement this functionality.