fix(general): bitbucket integration test failure

[MrTomerLevi]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Description

As we removed Image Referencer in #6386 the sca_image report is not longer generated for bitbucket files.
An integration test was expecting this report to exist in checkov_report_bitbucket_pipelines_cve.json file and failed.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[MrTomerLevi]

Old file format - array of 2 dicts :

[
   {"check_type": "bitbucket_pipeliens"...}.
    {"check_type": "sca_image"...}.
]

Modified file format - single dict:

{"check_type": "bitbucket_pipeliens"...}

[lirshindalman]

nice!!