Sparql template cleanup

[kmcginnes]

Description

Minor cleanup that doesn't change any critical logic.

• Adds dedent dependency which will remove indentation from strings
• Use dedent on SPARQL queries
• Convert closure expressions to functions

Validation

• Did a brief smoke test

Related Issues

• 384

• 344

Check List

• [x] I confirm that my contribution is made under the terms of the Apache 2.0 license.
• [x] I have run pnpm checks to ensure code compiles and meets standards.
• [x] I have run pnpm test to check if all tests are passing.
• [ ] I have covered new added functionality with unit tests if necessary.
• [ ] I have added an entry in the Changelog.md.

[vkagamlyk]

good to add dedent license to https://github.com/aws/graph-explorer/blob/main/THIRD_PARTY_LICENSES.txt