fix queryVulnsViaVulnNodeNeighbors to check for certifyVex edges

[ridhoq]

Description of the PR

queryVulnsViaVulnNodeNeighbors now searches for certifyVex edges

Fixes #1539

PR Checklist

• All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• All new changes are covered by tests
• If GraphQL schema is changed, make generate has been run
• If collectsub protobuf has been changed, make proto has been run
• All CI checks are passing (tests and formatting)
• All dependent PRs have already been merged

[pxp928]

Almost on the right path :). Thanks for the PR!

[pxp928]

let me know if that makes sense, I can elaborate more if needed.

[pxp928]

@ridhoq can you rebase this? Thanks!

[ridhoq]

@ridhoq can you rebase this? Thanks!

@pxp928 should be good to go now

[jeffmendoza]

Looks good, thanks! some minor comments.

[pxp928]

FYI @ridhoq made some updates in my PR to the vulnerability query. That will remove unnecessary calls to neighbors query: #1582