[Meta] Elastic Agent setup

[narph]

Repo setup tasks

• [x] .CI setup (fleet-ci)
• [x] Unified release
• [x] e2e testing https://github.com/elastic/elastic-agent/pull/54
• [x] Rebase, previous beats automations
• [ ] Changelog https://github.com/elastic/elastic-agent/issues/47
• [ ] Pinned version for the upstream dependencies (filebeat, metricbeat) while working with snapshots
• [x] Validate release process still applies https://github.com/elastic/observability-dev/blob/main/docs/dc/releases.md
• [x] Update documentation https://github.com/elastic/observability-docs/pull/1620 https://github.com/elastic/infra/pull/34859
• [x] Update license
• [x] Enable mergify https://github.com/elastic/infra/issues/34835
• [x] Alert control plane team for any elastic agent related PR's in the beats repo https://github.com/elastic/beats/pull/30618
• [x] Switch 8.2 snapshots to new repo https://github.com/elastic/infra/pull/34951
• [x] Remove elastic-agent directory from beats https://github.com/elastic/beats/pull/30559
• [x] Move elastic-agent related issues from the beats repo to the new elastic-agent repo
• [x] Update developer documentation (Usage of EXTERNAL, Expected directory layout, Usage of DEV)
• [x] Move out of beats deploy/kube/elastic agent templates https://github.com/elastic/beats/pull/31103, https://github.com/elastic/observability-docs/issues/1743

[mdelapenya]

For running the e2e, here you can find an explanation about the current state: https://github.com/elastic/e2e-testing/issues/2175#issuecomment-1055094748. TL;DR: it's possible to run the e2e tests for the new binaries. We need to merge #54 first.

[v1v]

What's the OS support to be executed in the CI? So far, it runs on:

• ubuntu
• arm
• windows-2019
• macos but in GitHub actions

Windows-2022 support has been added in https://github.com/elastic/elastic-agent/pull/62 but, what's the strategy? Is it needed? If so, when should it run?

[ph]

Added a new item to this meta issue: Update developer documentation (Usage of EXTERNAL, Expected directory layout, Usage of DEV)

[jlind23]

Closing this as done.