[Agent Builder] readonly attachments

[ppisljar]

Summary

Allows readonly attachments, makes all attachment types readonly by default and calls .getRepresentation() on the readonly types.

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 5270559

Failed CI Steps

• FTR Configs #85
• Scout: [ platform / fleet ] plugin

Test Failures

• [job] [logs] FTR Configs #85 / Cloud Security Posture Cloud Posture Rules Page - Counters "before each" hook for "Shows posture score when there are findings"
• [job] [logs] Scout: [ platform / fleet ] plugin / Integrations are visible but cannot be added
• [job] [logs] Scout: [ platform / fleet ] plugin / stateful - When the user has All privileges for Integrations but None for Fleet - Integrations are visible but cannot be added

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
agentBuilder	547.0KB	547.1KB	+54.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/agent-builder-common	357	358	+1

History

• 💔 Build #386406 failed 030d9cf
• 💔 Build #386289 failed e9075cf