Make `batch_create_nodes` method idempotent

[mohamedawnallah]

Description

To ensure the batch_create_nodes function's idempotence, we should switch from using CREATE to MERGE. While CREATE isn't inherently idempotent, MERGE is, as it combines CREATE and MATCH, creating a new row only when it doesn't already exist. You can refer to the Neo4j MERGE documentation for more details on how MERGE works.

Motivation and Context

Closes #89

How Has This Been Tested?

1. Repeated Pipeline Execution:

   • The data pipeline atlas_probes.py was executed multiple times without encountering any errors.

2. Pipeline with New Properties:

   • Executing the data pipeline atlas_probes.py multiple times, including new properties, reflected the changes accurately in the node properties within the Neo4j web interface.

Screenshots (if appropriate):

https://github.com/InternetHealthReport/internet-yellow-pages/assets/69568555/4dfb5767-182c-4c55-8a6a-8140819e7efc

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[romain-fontugne]

I'll close this one, as @m-appel came up with a new set of functions that should fix this.