[FIX] Remove default NB_API_QUERY_URL value and fix ports used by full-stack setup script

[alyssadai]

• Closes Non-robust default value for NB_API_QUERY_URL in Compose recipes #21
• Closes setup.sh steps use host port for GraphDB home when called inside container #39

Changes proposed in this pull request:

• Default value for NB_API_QUERY_URL removed, so this value now must always be manually provided
  • Replaced with placeholder in template.env
• setup.sh and graphdb_setup.sh now use the NB_GRAPH_PORT variable for GraphDB operations (more generic name also suits our plan to eventually have just one configurable port for GraphDB)

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• Tests have been added

For bug fixes:

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[surchs]

Thanks @alyssadai.

Two comments, take a look.

After that 🧑‍🍳

[neurobagel-bot]

🚀 PR was released in v0.0.1 🚀