Handbook: clarify vulnerability reporting

Add clarification of the vulnerability reporting: special considerations for confidential issues, how to request to enable private advisories.

Also add related FAQ entries.

Signed-off-by: Marta Rybczynska marta.rybczynska@eclipse-foundation.org

CC @mbarbero @netomi

@wbeaton please do not merge immediately, this is a source for discussion

@mbarbero @netomi @fcojperez @tiagolucas review needed

resolved all threads

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• e2ff0621...ff7d0efe - 7 commits from branch eclipse/technology/dash:master
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added 1 commit

• c1eb9e80 - Handbook: clarify vulnerability reporting

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resolved all threads

added 2 commits

• 6233cd3c - 1 commit from branch eclipse/technology/dash:master
• 50875696 - Handbook: clarify vulnerability reporting

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@wbeaton we're ready to go here

@wbeaton @mbarbero @mdelgado624 we're ready to go with this one

I'm away on vacation this week (and last). I'll merge it when I get back to the office next week.