Fix Qualys parser to prevent merging findings on different ports

[ArnaavSinghSandhu]

Description
Fix: Qualys Infrastructure Scan merging findings on different ports.

Currently, the Qualys parser collapses multiple findings of the same QID into a single finding if they occur on the same host, even if they are on different ports (e.g., a vulnerability found on both port 80 and port 443). This results in data loss during the import process.

This PR implements the following:

Updated parse_finding in dojo/tools/qualys/parser.py to correctly extract the tag from the Qualys XML.

Correctly maps these ports to the unsaved_endpoints and unsaved_locations attributes of the Finding object.

Ensures that findings remain distinct in DefectDojo by recognizing the unique port/endpoint combination.

Test results
I have verified this fix using the following steps:

New Unit Test: Added test_parse_file_with_multiple_ports_for_same_qid to unittests/tools/test_qualys_parser.py.

Sample Data: Created unittests/scans/qualys/test_qualys.xml which contains a single QID assigned to two different ports on the same host.

Execution: Ran the unit test suite inside the Docker environment.

Result: Ran 1 test in 0.009s. OK. The parser now correctly identifies 2 distinct findings instead of 1.

Documentation
No documentation changes are required as this is a bug fix for existing parser logic to bring it in line with expected DefectDojo behavior.

Checklist
[x] Bugfixes should be submitted against the bugfix branch.

[x] Give a meaningful name to your PR.

[x] Your code is flake8 compliant.

[x] Add applicable tests to the unit tests.