[8.19] [Synthetics]: Fixed monitor status rule control (elastic#218994) (elastic#219362)

# Backport

This will backport the following commits from `main` to `8.19`:
- [[Synthetics]: Fixed monitor status rule control
(elastic#218994)](elastic#218994)

<!--- Backport version: 9.6.6 -->

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

<!--BACKPORT [{"author":{"name":"Francesco
Fagnani","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-04-28T09:44:38Z","message":"[Synthetics]:
Fixed monitor status rule control (elastic#218994)\n\nThis PR closes
elastic#218968.\n\n\n\nhttps://github.com/user-attachments/assets/380cf606-7126-49e9-9ccc-8c0abfacef43","sha":"47736b21297ad59ddbcb83d436ae05d357475acd","branchLabelMapping":{"^v9.1.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:fix","backport:version","v9.1.0","v8.19.0","v8.18.1","v9.0.1","v8.17.6"],"title":"[Synthetics]:
Fixed monitor status rule
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Fixed monitor status rule control (elastic#218994)\n\nThis PR closes
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Fixed monitor status rule control (elastic#218994)\n\nThis PR closes
elastic#218968.\n\n\n\nhttps://github.com/user-attachments/assets/380cf606-7126-49e9-9ccc-8c0abfacef43","sha":"47736b21297ad59ddbcb83d436ae05d357475acd"}},{"branch":"8.19","label":"v8.19.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"8.18","label":"v8.18.1","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"9.0","label":"v9.0.1","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"8.17","label":"v8.17.6","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Francesco Fagnani <[email protected]>

Author: kibanamachine

x-pack/platform/plugins/shared/triggers_actions_ui/public/common/expression_items/value.tsx

@@ -92,8 +92,8 @@ export const ValueExpression = ({
                 min={0}
                 value={value}
                 isInvalid={Number(errors.length) > 0 && value !== undefined}
-                onChange={(e: any) => {
-                  onChangeSelectedValue(e.target.value as number);
+                onChange={(e) => {
+                  onChangeSelectedValue(+e.target.value);
                 }}
               />
             </EuiFormRow>