Change sample app name

[madurangasiriwardena]

Sample app name used in RegistryMountTestCase is duplicated and hence it can be failing due to the test execution order and other external factor to this test case.

Hence the test case name is changed.

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/12804970939

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/12804970939
Status: failure

[madurangasiriwardena]

Below test cases are failing in the PR builder which are already failing.

[ERROR] OAuthAppsWithSameClientIdTestCase.testOAuthApplicationLoginSuccess:373->authenticateUser:633 SessionDataKeyConsent keyValues map is null. expected object to not be null
 [ERROR] OIDCPasswordGrantTest.testClear:84->OIDCAbstractIntegrationTest.deleteUser:115 User deletion failed expected:<204> but was:<404>
 [ERROR] OIDCPasswordGrantTest.testInit:73->OIDCAbstractIntegrationTest.createUser:95 User creation failed expected:<201> but was:<400>
 [INFO] 
 [ERROR] Tests run: 3035, Failures: 3, Errors: 0, Skipped: 5