[Logs Onboarding] API key generation states

[yngrdyn]

closes #158567.

Summary

This PR introduces APIKey generation states.

Changes

• Route POST /internal/observability_onboarding/custom_logs/install_shipper_setup was split into GET /internal/observability_onboarding/custom_logs/install_shipper_setup which is now in charge of determining current setup (kibana urls, es url) and POST /internal/observability_onboarding/custom_logs/save is now in charge of generating the apiKey and save the flow state.
• Dedicated component ApiKeyBanner to handle the different states of the apiKey generation.

Screenshots

• when ApiKey is being generated, notice the placeholder $API_KEY in script and yaml config

• when ApiKey has been successfully generated, notice the returned apiKey in script and yaml config

• when an error occurred while generating the ApiKey, notice the placeholder $API_KEY in script and yaml config

• when user doesn't have required permissions to generate the ApiKey, notice the placeholder $API_KEY in script and yaml config

[apmmachine]

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[achyutjhunjhunwala]

@yngrdyn I guess the warning message here needs to be changed. I was using something similar previously for my PR

@sqren - I believe this is applicable here as well ?

[ogupte]

few small nits, but it looks good.

[yngrdyn]

I guess the warning message here needs to be changed

@achyutjhunjhunwala and @sqren this was changed to

e4c6b8d

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: dc13f5f

Failed CI Steps

• FTR Configs #7

Test Failures

• [job] [logs] FTR Configs #7 / machine learning - short tests model management trained models for ML power user with imported models starts deployment of the imported model pt_tiny_ner

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
observabilityOnboarding	35	36	+1

Async chunks

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

id	before	after	diff
observabilityOnboarding	41.7KB	44.6KB	+2.8KB

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
securitySolution	413	417	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
securitySolution	497	501	+4
total			+6

History

• 💚 Build #133695 succeeded e4c6b8d
• 💚 Build #133623 succeeded 8d4a710
• 💚 Build #133371 succeeded c182f03
• 💔 Build #133329 failed 95dc6eed1cded0c43e64c30c43dddc413bf2f9a1
• 💔 Build #133319 failed d28b43dbe7e060173949fe078fc536d693aba554

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