[Logstash]: Calculate Logstash persistent disk fill in %

### Integration Name

Logstash [logstash]

### Dataset Name

logstash.pipeline

### Integration Version

latest

### Agent Version

latest

### OS Version and Architecture

doesn't matter

### User Goal

Instead of ding this in lens and /or ES|QL : `last_value(logstash.pipeline.total.queues.current_size.bytes)/max(logstash.pipeline.total.queues.max_size.bytes)` I can simpyl say `logstash.pipeline.total.queues.current_pct`.

### Existing Features

Because it's annoyign and you cannot do it in ES|Ql because there is no last and then the formula is not supported in an alert.

### What did you see?

it's in the docs

### Anything else?

_No response_