[Bug] OPERA RTC-S1 polarization stripped in ASF search download overwriting files

[dbekaert]

Describe the bug
When downloading an OPERA-RTC burst using asf search; it does not track the polarization in the filename leading that the files gets overwritten and only one polarizationg ets downloaded.
Please add polarization to the filename, consistent to the OPERA filenaming convention and also what is done in the browser ASF search page

To Reproduce

asf.ASFSearchOptions(**{
    'operaBurstID': ['T008_015803_IW1'], 
    'polarization': ['VV', 'HH', 'HV', 'VH'], 
    'dataset': ['OPERA-S1'], 
    'processingLevel': ['RTC'], 
    'start': '2026-02-01T00:00:00Z', 
    'end': '2026-02-17T23:59:59Z', 
    'processingDate': '2026-02-11T00:00:00UTC'}
)

Additional context
See this line in the code: https://github.com/asfadmin/Discovery-asf_search/blob/master/asf_search/ASFProduct.py#L195

See this PR that has reported similar fix to issue: #320