[tenable-vuln-management]: Fix crash when DomainName creation has a non-compliant value

[Ninoxe]

Proposed changes

• Skip the DomainName object creation if the value is non-RFC-compliant FQDNs with a warning message

Related issues

• Close [tenable-vuln-management] Connector crashes on FQDN with underscore when creating STIX DomainName object #6325

Checklist

• I consider the submitted work as finished
• I have signed my commits using GPG key.
• I tested the code for its functionality using different use cases
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (151df2a) and HEAD (6e316ad). Click for more details.

HEAD has 101 uploads less than BASE

Flag	BASE (151df2a)	HEAD (6e316ad)
connectors	103	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6545       +/-   ##
===========================================
- Coverage   27.96%    0.57%   -27.39%     
===========================================
  Files        1842     1782       -60     
  Lines      112094   114065     +1971     
===========================================
- Hits        31344      660    -30684     
- Misses      80750   113405    +32655     

Files with missing lines	Coverage Δ
...t/src/tenable_vuln_management/converter_to_stix.py	89.58% <100.00%> (+0.45%)	⬆️

... and 986 files with indirect coverage changes

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[jabesq]

LGTM 👍