[Alerting] Fix the charts on Log Threshold Rule Alert Detail page (#1…

…60321)

## Summary

This PR fixes #160320 by changing the chart from the `CriterionPreview`
chart, borrowed from the Log Threshold Rule, to an embedded Lens
visualization that represents the correct document count in one chart. I
also took the liberty of changing the ratio chart to use the same
technique for consistency sake.

## Count with multiple conditions

### Before

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/6c6a27ea-f8e4-491f-8a12-261d0ed13dcb">

### After

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/9b18ebe9-e911-4e40-8911-bee55cd7d245">

## Count with multiple conditions and a group by

### Before

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/7b9462da-55b2-4f54-ba09-3c55b372ae2c">


### After

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/b268caed-242f-430a-ade0-14bf491ec899">

## Ratio with multiple conditions

### Before

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/55b8dfa2-7789-433b-bffd-e412bdb08b3f">

### After

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/a029bf8a-3ba1-4e16-87bd-097ebc526a4e">


## Ratio with multiple conditions and a  group by

### Before

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/61ddf1e9-c5ad-4546-a539-15a51ee563c0">

### After

<img width="736" alt="image"
src="https://github.com/elastic/kibana/assets/41702/15b0aaa3-4ef9-47f6-baba-24869feae77e">

x-pack/packages/observability/alert_details/src/helpers/get_padded_alert_time_range.ts

@@ -8,9 +8,8 @@
 import moment from 'moment';
 
 export interface TimeRange {
-  from?: string;
-  to?: string;
-  interval?: string;
+  from: string;
+  to: string;
 }
 
 export const getPaddedAlertTimeRange = (alertStart: string, alertEnd?: string): TimeRange => {