CLOUDP-344284: add missing admin password to terraform destroy in windows tests

[blva]

Proposed changes

Jira ticket: CLOUDP-344284

Fixes the windows 11 task clean up.

Error logs:

 [2025/11/03 03:49:16.113] Running command 'subprocess.exec' in function 'terraform destroy' (step 4 of 4) in block 'teardown_task'.
 [2025/11/03 03:49:17.109] �[0m�[1mvar.admin_password�[0m
 [2025/11/03 03:49:17.109]   The admin password for the Windows VM
 [2025/11/03 03:49:17.132] �[31m╷�[0m�[0m
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0m�[1m�[31mError: �[0m�[0m�[1mNo value for required variable�[0m
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0m
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0m�[0m  on main.tf line 30:
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0m  30: �[4mvariable "admin_password"�[0m {�[0m
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0m
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0mThe root module input variable "admin_password" is not set, and has no
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0mdefault value. Use a -var or -var-file command line argument to provide a
 [2025/11/03 03:49:17.132] �[31m│�[0m �[0mvalue for this variable.
 [2025/11/03 03:49:17.132] �[31m╵�[0m�[0m
 [2025/11/03 03:49:17.133]   �[1mEnter a value:�[0m �[0m
 [2025/11/03 03:49:17.133] Command 'subprocess.exec' in function 'terraform destroy' (step 4 of 4) in block 'teardown_task' failed: process encountered problem: exit code 1.

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation in document requirements section listed in CONTRIBUTING.md (if appropriate)
• I have addressed the @mongodb/docs-cloud-team comments (if appropriate)
• I have updated test/README.md (if an e2e test has been added)
• I have run make fmt and formatted my code

Further comments