Replace angle bracket placeholders with alphanumeric examples in env file (#2950)

The example env file used angle bracket placeholders (e.g., <DATABASE_NAME>)
which were causing Windows tests to fail. When these placeholder values
were URL-encoded in the VuMark test, the < and > characters became %3C and
%3E, which didn't match the mock's [A-Za-z0-9]+ URL pattern. Replacing
all placeholders with descriptive alphanumeric examples fixes this issue
while maintaining clarity about what each value represents.

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

Author: adamtheturtle

vuforia_secrets.env.example

@@ -1,21 +1,21 @@
-VUFORIA_TARGET_MANAGER_DATABASE_NAME=<DATABASE_NAME>
+VUFORIA_TARGET_MANAGER_DATABASE_NAME=example_database_name
 
-VUFORIA_SERVER_ACCESS_KEY=<SERVER_ACCESS_KEY>
-VUFORIA_SERVER_SECRET_KEY=<SERVER_SECRET_KEY>
+VUFORIA_SERVER_ACCESS_KEY=example_server_access_key
+VUFORIA_SERVER_SECRET_KEY=example_server_secret_key
 
-VUFORIA_CLIENT_ACCESS_KEY=<CLIENT_ACCESS_KEY>
-VUFORIA_CLIENT_SECRET_KEY=<CLIENT_SECRET_KEY>
+VUFORIA_CLIENT_ACCESS_KEY=example_client_access_key
+VUFORIA_CLIENT_SECRET_KEY=example_client_secret_key
 
-INACTIVE_VUFORIA_TARGET_MANAGER_DATABASE_NAME=<INACTIVE_DATABASE_NAME>
+INACTIVE_VUFORIA_TARGET_MANAGER_DATABASE_NAME=example_inactive_database_name
 
-INACTIVE_VUFORIA_SERVER_ACCESS_KEY=<INACTIVE_SERVER_ACCESS_KEY>
-INACTIVE_VUFORIA_SERVER_SECRET_KEY=<INACTIVE_SERVER_SECRET_KEY>
+INACTIVE_VUFORIA_SERVER_ACCESS_KEY=example_inactive_server_access_key
+INACTIVE_VUFORIA_SERVER_SECRET_KEY=example_inactive_server_secret_key
 
-INACTIVE_VUFORIA_CLIENT_ACCESS_KEY=<INACTIVE_CLIENT_ACCESS_KEY>
-INACTIVE_VUFORIA_CLIENT_SECRET_KEY=<INACTIVE_CLIENT_SECRET_KEY>
+INACTIVE_VUFORIA_CLIENT_ACCESS_KEY=example_inactive_client_access_key
+INACTIVE_VUFORIA_CLIENT_SECRET_KEY=example_inactive_client_secret_key
 
-VUMARK_VUFORIA_TARGET_MANAGER_DATABASE_NAME=<VUMARK_DATABASE_NAME>
-VUMARK_VUFORIA_TARGET_ID=<VUMARK_TARGET_ID>
+VUMARK_VUFORIA_TARGET_MANAGER_DATABASE_NAME=example_vumark_database_name
+VUMARK_VUFORIA_TARGET_ID=examplevumarktargetid
 
-VUMARK_VUFORIA_SERVER_ACCESS_KEY=<VUMARK_SERVER_ACCESS_KEY>
-VUMARK_VUFORIA_SERVER_SECRET_KEY=<VUMARK_SERVER_SECRET_KEY>
+VUMARK_VUFORIA_SERVER_ACCESS_KEY=example_vumark_server_access_key
+VUMARK_VUFORIA_SERVER_SECRET_KEY=example_vumark_server_secret_key