Adding gcp_conn_id to template_fields for GCS Operators

[vitstransky]

PR to add gcp_conn_id to the template_fields for GCS* operators. I validated that gcp_conn_id is parameter for each of these operators before adding it to template_fields. GCSDeleteBucketOperator and GCSSynchronizeBucketsOperator already have gcp_conn_id as template field.

According to previous issue #58236, tests are not required for this.

closes: #58296

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[boring-cyborg]

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[jroachgolf84]

I am not a committer, so my review holds no weight. But this looks good to me!

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.