[8.x] chore(slo): add access:public missing options for public routes (…

…#195114) (#195427)

# Backport

This will backport the following commits from `main` to `8.x`:
- [chore(slo): add access:public missing options for public routes
(#195114)](#195114)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Kevin
Delemme","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-10-08T14:21:47Z","message":"chore(slo):
add access:public missing options for public routes
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add access:public missing options for public
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add access:public missing options for public routes
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add access:public missing options for public routes
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BACKPORT-->

Co-authored-by: Kevin Delemme <[email protected]>

x-pack/plugins/observability_solution/slo/server/routes/slo/route.ts

@@ -516,6 +516,7 @@ const deleteSloInstancesRoute = createSloServerRoute({
   endpoint: 'POST /api/observability/slos/_delete_instances 2023-10-31',
   options: {
     tags: ['access:slo_write'],
+    access: 'public',
   },
   params: deleteSLOInstancesParamsSchema,
   handler: async ({ context, params }) => {
@@ -532,6 +533,7 @@ const findSloDefinitionsRoute = createSloServerRoute({
   endpoint: 'GET /api/observability/slos/_definitions 2023-10-31',
   options: {
     tags: ['access:slo_read'],
+    access: 'public',
   },
   params: findSloDefinitionsParamsSchema,
   handler: async ({ context, params, logger }) => {