[6.16.z] delete subscription manifest so it can re imported again

[Satellite-QE]

Cherrypick of PR: #17142

Problem Statement

• test_sca_end_to_end and test_positive_expired_SCA_cert_handling tests are failing imported manifest issue.
• Error: This subscription management application has already been imported by another owner
• I guess test_positive_create test uses mdoule_manifest_org fixture and it is creating issue while importing manifest

Solution

Delete test_positive_create test, as it uses module_sca_manifest fixture and which is used inside any *_sca_manifest_org fixture that executed on so many places.

Local test execution

============================= test session starts ==============================
collecting ... 2024-12-10 22:29:23 - robottelo.collection - INFO - Processing test items to add testimony token markers
collected 11 items / 8 deselected / 3 selected

tests/foreman/api/test_subscription.py::test_positive_create 
tests/foreman/api/test_subscription.py::test_sca_end_to_end[rhel7-ipv4] 
tests/foreman/api/test_subscription.py::test_positive_expired_SCA_cert_handling[rhel7-ipv4] 

=========== 3 passed, 8 deselected, 58 warnings in 697.74s (0:11:37) ===========

PRT test Cases example

trigger: test-robottelo
pytest: tests/foreman/api/test_subscription.py

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/api/test_subscription.py -k 'test_sca_end_to_end or test_positive_expired_SCA_cert_handling'

[Satellite-QE]

PRT Result

Build Number: 9590
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/api/test_subscription.py -k test_sca_end_to_end or test_positive_expired_SCA_cert_handling --external-logging
Test Result : =========== 2 passed, 8 deselected, 54 warnings in 747.44s (0:12:27) ===========