[ML] Update embeddable license check for capability check

[jgowdyelastic]

Supersedes #267902

The changes added in #267902 were unnecessary, rather than checking the licence, we should be checking capabilities, which are controlled by the licence along with other other factors.

This PR removes the previously added licence check functions and adds a new async capability check.
Named checkPermissionAsync to match the already existing checkPermission

[infra-vault-gh-plugin-prod]

Pinging @elastic/ml-ui (:ml)

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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[kibanamachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 7cbce74

Failed CI Steps

• FTR Configs #120
• FTR Configs #149

Test Failures

• [job] [logs] FTR Configs #120 / Serverless Common UI - Home Page Sample data in serverless "after all" hook for "Sample data loads"

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
ml	5.6MB	5.6MB	-15.8KB

Page load bundle

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

id	before	after	diff
ml	88.9KB	88.7KB	-226.0B

Unknown metric groups

async chunk count

id	before	after	diff
ml	114	116	+2

cc @jgowdyelastic