Adds error checking for whether big query dataset exists

Describe your changes and why you are making these changes

This PR adds error checking to the BigQuery executor to see if the dataset exists before trying to save an artifact to it.

ENG 2947

[x] I have created a descriptive PR title. The PR title should complete the sentence "This PR...".
[x] I have performed a self-review of my code.
[x] I have included a small demo of the changes. For the UI, this would be a screenshot or a Loom video.
[ ] If this is a new feature, I have added unit tests and integration tests.
[ ] I have run the integration tests locally and they are passing.
[x] I have run the linter script locally (See python3 scripts/run_linters.py -h for usage).
[x] All features on the UI continue to work correctly.
[x] Added one of the following CI labels:
- run_integration_test: Runs integration tests
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