move timestamp up such that it is not skipped

[pxp928]

Description of the PR

there is a situation that can cause the deps.dev collector to not add the timestamp. This can cause the error:

error: unable to ingest document due to ingestion error deps.dev : error assembling graphs for \"deps.dev\" : hasSBOMPkgs failed with error: input: ingestHasSBOMs hasSBOMS contains a zero time\n","errorType":"wrapError"}

This PR moves the timestamp assignment at the beginning of the function such that it is never skipped.

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 GraphQL schema is changed, GraphQL client updates/additions have been made
• If OpenAPI spec is changed, make generate has been run
• If ent 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