Appeng 5327 create vex on none vulnerable and updating missing fields

[gnetanel]

• Create a vex report also when scan results are none vulnerable
• Add purl to Vex report
• Update Vex report tracking.id to be unique by adding a uuid suffix
• Update flags.label with the correct precise justification why product/repo is not affected by the given vulnerability

[vbelouso]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Code Security	0	0	0	0	0 issues

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