[Fleet] Fix package archive bug + reenable Endpoint tests

[kpollich]

Summary

Fixes failing endpoint tests - cc @kevinlog

@hop-dev @criamico - I tracked down the issue causing endpoint tests to fail to this chunk of code. As it stands, we are always querying EPR to fetch the archive buffer for a given package, even if it's already installed.

This means that bundled packages (which don't define a download property as they're ArchivePackage records in code) were failing to fetch from EPR. We were querying a URL like localhost:12345undefined and throwing 502's during package policy creation with an Error: Invalid URL thrown.

I've pushed up a workaround here where we "fill in" the downwload property on these packages, but I don't think this will work in all situations (namely APM, where the bundled package name is dynamic based on the stack version). Is there a way to fetch these archive buffer objects from the cache instead of always querying from EPR via getResponseStream?

[kpollich]

@elasticmachine merge upstream

[kpollich]

@elasticmachine merge upstream

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[criamico]

LGTM, thanks for this

[criamico]

Is there a way to fetch these archive buffer objects from the cache instead of always querying from EPR via getResponseStream?

I had a similar question in my original PR but unfortunately I didn't realise that it would break the install (for some reason I had no tests failing in the branch).
I think that we need to find a way to source the archiveBuffer from the cache as you said. We can file a separate ticket for it to find a robust solution.

[kpollich]

@elasticmachine merge upstream

[kevinlog]

LGTM! Thank you for fixing this!

[kibana-ci]

💛 Build succeeded, but was flaky

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• Commit: a8a17fe

Failed CI Steps

• Fleet Cypress Tests

Test Failures

• [job] [logs] Fleet Cypress Tests / Home page Agents Quick Start Install Fleet Server

Metrics [docs]

✅ unchanged

History

• 💚 Build #80515 succeeded 72605d4
• 💚 Build #80433 succeeded 2d6e48d
• 💚 Build #80249 succeeded 8c136f1
• 💔 Build #79865 failed ab670b0
• 💔 Build #79828 failed 90705eb
• 💔 Build #79532 failed dda9990

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@elasticmachine merge upstream

cc @kpollich

[kibanamachine]

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Status	Branch	Result
✅	8.5

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