Replace usage of public SO client with Fleet get Bulk Assets api

[criamico]

Closes #158598

Summary

Removes usage of deprecated SO client to fetch dashboard assets; Replaced with a call to the new Fleet endpoint epm/bulk_assets (openapi)

Testing

I'm not very familiar with stack monitoring, so I tried to reproduce what's described in the PR that originally introduced this dashboard; I couldn't trigger the modal but I can see the endpoint in the network requests:

It should be enough to test this change since is very small.

[apmmachine]

🤖 GitHub comments

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Just comment with:

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

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[criamico]

@elasticmachine merge upstream

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[criamico]

I refactored this as I was trying to export it with PackageService from /server/plugin, so I decided to keep this change even if it's not strictly related to this PR

[criamico]

@elasticmachine merge upstream

[criamico]

@elasticmachine merge upstream

[criamico]

@elasticmachine merge upstream

[criamico]

@elasticmachine merge upstream

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 6a83e49

Failed CI Steps

• Fleet Cypress Tests

Test Failures

• [job] [logs] Fleet Cypress Tests / View agents list Bulk actions should allow to bulk upgrade agents and cancel that upgrade

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
fleet	1067	1069	+2

Async chunks

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

id	before	after	diff
monitoring	461.1KB	461.2KB	+173.0B

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
fleet	33	34	+1

Page load bundle

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

id	before	after	diff
fleet	130.8KB	130.8KB	+32.0B

Unknown metric groups

API count

id	before	after	diff
fleet	1183	1185	+2

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	13	15	+2
securitySolution	411	415	+4
total			+6

References to deprecated APIs

id	before	after	diff
monitoring	5	3	-2

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	494	498	+4
total			+6

History

• 💚 Build #135696 succeeded 5eb5b07
• 💔 Build #135667 failed 469bfc5
• 💛 Build #135594 was flaky 1dc8b33
• 💔 Build #135540 failed a93a7ef
• 💔 Build #135515 failed afdd7b6
• 💔 Build #135486 failed 01f5d02

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

cc @criamico

[juliaElastic]

LGTM