chore(slo): prefill slo edit form on update error

[kdelemme]

Resolves #168759
Resolves #167986

🍒 Summary

This PR handles every SLO fields from the URL state for both the create and edit mode. The values in the URL state can be partially provided.
When an error happens during the update, we also redirect the user back to the form, while populating it with the previously entered values.

Flow	URL _a query parameter	Behaviour
Create	present	Use the _a query parameter values merged with the default form values to populate the initial form values
Create	not present	Use the default form values to populate the initial form values
Edit	present	Use the _a query parameter merged with the default form values to populate the initial form values
Edit	not present	Use the SLO values to populate the initial form values

[apmmachine]

🤖 GitHub comments

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• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
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[elasticmachine]

Pinging @elastic/actionable-observability (Team: Actionable Observability)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: e0bfe65

Failed CI Steps

• Investigations - Security Solution Cypress Tests #5

Test Failures

• [job] [logs] Investigations - Security Solution Cypress Tests #5 / Fields Browser Fields Browser rendering "before each" hook for "displays a search results label with the expected count of fields matching the filter input" "before each" hook for "displays a search results label with the expected count of fields matching the filter input"

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
observability	1.1MB	1.1MB	+836.0B

Page load bundle

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

id	before	after	diff
observability	101.3KB	101.3KB	+70.0B

History

• 💚 Build #168787 succeeded c49a1c7
• 💔 Build #168669 failed 1330c10
• 💔 Build #168578 failed 4acaa3f
• 💚 Build #168301 succeeded dae3835
• 💔 Build #168252 failed a9a9322
• 💔 Build #167927 failed 32d097f

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

cc @simianhacker

[simianhacker]

LGTM