Add eol to e2e and fix certifier logic

[robert-cronin]

Description of the PR

Fixes #2395

In addition to adding the e2e test query, this PR will also address some issues with the EOL certifier logic. For example, the parsing of purls now uses standard helper methods and the check for whether a node has EOL data is now more specific to mitigate false positives.

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

[robert-cronin]

This PR should be merged after #2391

[robert-cronin]

e2e test working locally:

@@@@ Running query EndOfLifeQ1