[Ingest Manager] Validate agent version <= Kibana version

[nchaulet]

Summary

Resolve #69922

When using Fleet: validate that Elastic agent version <= Kibana version otherwise throw a 400 error

How to test this?

You can try to manually enroll an agent with

curl --request POST \
  --url http://localhost:5601/api/ingest_manager/fleet/agents/enroll \
  --header 'authorization: ApiKey ${REPLACE_BY_YOUR_KEY}' \
  --header 'content-type: application/json' \
  --header 'kbn-xsrf: as' \
  --data '{
 "type": "PERMANENT",
	"metadata": { "local" : {"elastic": {"agent": {"version": "99.0.0"} }}, "user_provided": {}}
}'

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: a0b0b73

Build metrics

✅ unchanged

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

[EricDavisX]

the latest 8.0 snapshot is failing when I try to enroll an Agent. Did we not update the UI 'enroll command' to be in line with this api change? we can track it in this issue: #70726

[jfsiii]

I think .lte or another comparison function is easier to understand. I had to look up the compare and it results to understand what was happening.

Do we need to set the includePrerelease option https://github.com/npm/node-semver#functions to deal with values like 8.0.0-SNAPSHOT?