[ML] AIOps: 8.16 Log Rate Analysis improvements.

Break out from the full backlog in #187683.
Follow up to #181111.

```[tasklist]
### API
- [ ] https://github.com/elastic/kibana/pull/187669
- [ ] https://github.com/elastic/kibana/pull/188137
- [ ] https://github.com/elastic/kibana/pull/189155
- [ ] https://github.com/elastic/kibana/pull/189863
```

```[tasklist]
### UI
- [x] Add sorting for `Log rate change` column (https://github.com/elastic/kibana/pull/193501)
- [x] Persist columns selected for display in the local storage (or similar) (https://github.com/elastic/kibana/pull/193501)
- [ ] https://github.com/elastic/kibana/pull/188648
- [ ] https://github.com/elastic/kibana/pull/188913
- [ ] https://github.com/elastic/kibana/pull/192243
```

```[tasklist]
### Analysis
```

```[tasklist]
### Text field pattern support
```

```[tasklist]
### Observability Alert Details Pages
- [ ] https://github.com/elastic/kibana/pull/188012
```

```[tasklist]
### Observability AI Assistant Context
- [ ] "Reset" should reset everything, including the contextual insight. https://github.com/elastic/kibana/pull/186509#discussion_r1647732552
```

```[tasklist]
### Telemetry
```

```[tasklist]
### Workflows
```




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[ML] AIOps: 8.16 Log Rate Analysis improvements. #187684

walterra
openedon Jul 5, 2024

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