fix(import-document): prevent IP addresses being classified as phone numbers (#6677)

[steadytao]

Proposed changes

• prevent IP addresses matched by the phone-number expression from being classified as phone numbers
• preserve the existing IP filtering behaviour
• add regression tests for valid IPv4 addresses, filtered addresses and phone numbers

Related issues

• Closes fix(import-document): IPv4 addresses extracted as Phone-Number observables by import-document connector #6677

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

[Copilot]

Pull request overview

This PR fixes a misclassification bug in the import-document connector where dotted IPv4 addresses could be matched by the phone-number regex and incorrectly emitted as Phone-Number observables. It adds a post-processing guard to drop “phone number” matches that are valid IPs, while keeping the existing IP whitelist/filter behavior intact.

Changes:

• Discard Phone-Number.value matches that parse as valid IP addresses (so IPv4s won’t be reclassified as phone numbers).
• Preserve existing IP filtering/whitelisting behavior (e.g., filtered IPs remain omitted rather than reappearing as phone numbers).
• Add regression tests covering valid IPv4s, filtered IPv4s, and real phone-number matches.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal-import-file/import-document/src/reportimporter/report_parser.py	Adds an ipaddress.ip_address() check to drop phone-number matches that are actually IP addresses.
internal-import-file/import-document/tests/test_report_parser_observables.py	New regression tests ensuring IPv4s aren’t classified as phone numbers, filtered IPs stay filtered, and phone numbers still match.

[steadytao]

Bit of a band-aid fix but phone number handling does have to be fairly broad for its intended use-case. Perhaps aligning against E.164 may be worth considering.