178c7a48fc
## Summary
* Fixes a critical bug where the missing status for the REST route was missing
* Fixes a bug with the 400 not being used for the missing index in some cases
* Changes create and update to NO LONGER allow immutable to be passed
* Fixes a bug with the add prepackaged schema to where you could use `immutable: false`. Now it is required to be missing or set to `immutable: true` within it.
* Cleans up unit tests
To use the critical bug missing status for the REST route:
```ts
GET /api/detection_engine/rules/prepackaged/_status
```
And you will get back:
```ts
{
"rules_installed": 252,
"rules_not_installed": 87,
"rules_not_updated": 0
}
```
See the script:
```ts
get_prepackaged_rules_status.sh
```
for more details
### Checklist
Use ~~strikethroughs~~ to remove checklist items you don't feel are applicable to this PR.
~~- [ ] This was checked for cross-browser compatibility, [including a check against IE11](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility)~~
~~- [ ] Any text added follows [EUI's writing guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses sentence case text and includes [i18n support](https://github.com/elastic/kibana/blob/master/packages/kbn-i18n/README.md)~~
~~- [ ] [Documentation](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#writing-documentation) was added for features that require explanation or tutorials~~
- [x] [Unit or functional tests](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#cross-browser-compatibility) were updated or added to match the most common scenarios
~~- [ ] This was checked for [keyboard-only and screenreader accessibility](https://developer.mozilla.org/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility#Accessibility_testing_checklist)~~
### For maintainers
~~- [ ] This was checked for breaking API changes and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)~~
- [x] This includes a feature addition or change that requires a release note and was [labeled appropriately](https://github.com/elastic/kibana/blob/master/CONTRIBUTING.md#release-notes-process)
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| server/lib | ||