Remove references to node type

[rwalworth]

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👾 Description of the issue

The function getNodeType() in setup_Tests.js and NODE_TYPE in the .env files are remnants of an old implementation that is no longer used. These can be removed.

Proposed Solution:

Remove the getNodeType() function from setup_Tests.js and the NODE_TYPE variable in the .env.custom_node and .env.testnet environment variable files. To verify functionality, follow the directions in the README to run an SDK server, and hedera-local-node if you choose to test locally, then run npm run test to run all tests. All tests should pass and no errors should be observed.

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[CodeLeom]

please assign this to me