Improve Kibana policy API wrappers: add IsProtected flag, add context

[aleksmaus]

What does this PR do?

• Adds IsProtected to the AgentPolicy.
• Improves Kibana policy API wrappers with added context parameter

Why is it important?

Allows to move over more custom code for E2E tests with tamper protection.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.md

[elasticmachine]

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• Start Time: 2023-08-08T18:12:44.225+0000

• Duration: 9 min 44 sec

Test stats 🧪

Test	Results
Failed	0
Passed	791
Skipped	25
Total	816

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[elasticmachine]

💚 Build Succeeded

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• Commit: 309c983

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• 💚 Build #36 succeeded 8360205
• 💚 Build #35 succeeded d743e26

[ycombinator]

LGTM.