docs: Update env var names to use DANDI_TESTS_ prefix

Co-authored-by: candleindark <[email protected]>

Author: Copilot

DEVELOPMENT.md

@@ -90,16 +90,16 @@ development command line options.
 - `DANDI_TESTS_NO_VCR` — When set, the use of vcrpy to playback captured HTTP
   requests during testing will be disabled
 
-- `DANDI_TEST_INSTANCE_NAME` -- Sets the instance name for the Docker Compose
+- `DANDI_TESTS_INSTANCE_NAME` -- Sets the instance name for the Docker Compose
   test environment (passed as `DJANGO_DANDI_INSTANCE_NAME`). Defaults to
   `DANDI`. Useful for testing vendorized instances.
 
-- `DANDI_TEST_INSTANCE_IDENTIFIER` -- Sets the instance identifier (RRID) for
+- `DANDI_TESTS_INSTANCE_IDENTIFIER` -- Sets the instance identifier (RRID) for
   the Docker Compose test environment (passed as
   `DJANGO_DANDI_INSTANCE_IDENTIFIER`). Defaults to `RRID:ABC_123456`. Useful
   for testing vendorized instances.
 
-- `DANDI_TEST_DOI_PREFIX` -- Sets the DOI API prefix for the Docker Compose
+- `DANDI_TESTS_DOI_PREFIX` -- Sets the DOI API prefix for the Docker Compose
   test environment (passed as `DJANGO_DANDI_DOI_API_PREFIX`). Defaults to
   `10.80507`. Useful for testing vendorized instances.