[Fleet] Allow to upload package for non superuser

[nchaulet]

Summary

Resolve #166473

Allow to upload package for non superuser, user with permission fleet all and integration all should be able to install a package by upload. cc @kpollich

How to test

Automated

I updated the related api integration tests

Manual tests

1. create an api key with a superuser
2. install a package

curl -XPOST -H 'content-type: application/zip' -H 'kbn-xsrf: true' -H 'Authorization: ApiKey ***' http://localhost:5601/api/fleet/epm/packages --data-binary @test_package-0.1.0.zip

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[juliaElastic]

🚀

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: f549f8d

Metrics [docs]

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
fleet	152.8KB	152.8KB	+11.0B

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @nchaulet