span composite count must be > 1

## Describe the bug

From the APM Agents spec (https://github.com/elastic/apm/blob/main/specs/agents/handling-huge-traces/tracing-spans-compress.md?plain=1#L137-L138):

> - `composite`
- `count`: The number of compressed spans this composite span represents.
The minimum count is 2 as a composite span represents at least two spans.

It looks like the java agent is reporting composite spans with a lower count. The following error was observed in ecs logs:

`validation error: span: composite: 'count': validation rule 'min(2)' violated`

## Steps to reproduce

I don't have those unfortunately :(

This is part of the ops KPI review

## Expected behavior

Composite count must be > 1

## Debug logs

`validation error: span: composite: 'count': validation rule 'min(2)' violated`