Update datalake_exporter.py database

[mwe-sandag]

Proposed changes

migrate database change database to variable in datalake_exporter.py in order to easily change it to a read-in property in upcoming changes

Impact

migrate database

Types of changes

• [ ] Bugfix (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 not work as expected)
• [ ] Documentation Update (if none of the other choices apply)

How has this been tested?

ran datalake exporter for existing scenario to write to dev

Checklist:

• [X ] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X ] My changes generate no new warnings

Further comments

testing process was pretty slow, datalake exporter may require investigation if this continues