test: update Postgres.js tests

[hauleth]

• test: increase pool size in external test suite to match nano instances
• test: make timeouts configurable
• test: disable prepared transactions test, as these are disabled for security reasons
• test: disable cursor tests in transaction mode
• test: disable custom socket test
• test: disable MAX_PARAMETERS_EXCEEDED test
• test: disable query format errors test
• test: run connection reserving test only in session mode
• test: make Postgres.js more verbose
• test: ensure connections with different parameters are available where needed
• test: fix typo in test name