Fix default last scan date formatter

[asteriscos]

Description

Hi team,
this PR changes de default last scan date parser to be able to catch dates returned by Wazuh API when no vulnerabilities scan has been made. It prepares the parser to format any date string starting with 1970 (default last scan date in the API response).

Default last scan response example:

{
    "data": {
        "affected_items": [
            {
                "last_full_scan": "1970-01-01T00:00:00+00:00",
                "last_partial_scan": "1970-01-01T00:00:00+00:00"
            }
        ],
        "total_affected_items": 1,
        "total_failed_items": 0,
        "failed_items": []
    },
    "message": "Last vulnerability scans of the agent were returned",
    "error": 0
}

Issues Resolved

Closes #4959

Evidence

Test

• Set up a new environment without any vulnerabilities scan
• Go to Vulnerabilities / Inventory
• See the default dates as -

Check List

• All tests pass
  • yarn test:jest
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[Desvelao]

review:

✔️ code
✔️ test

Screenshot

[github-actions]

Code coverage (Jest)	%	values
Statements	8.69%	( 3210 / 36958 )
Branches	4.43%	( 1271 / 28682 )
Functions	7.59%	( 696 / 9166 )
Lines	8.75%	( 3097 / 35378 )

[yenienserrano]

LGTM