patchChanelog remove additional text from changelog

[egorikftp]

Is your feature request related to a problem? Please describe.
I sometimes add special highlights related to change.
For example:

 # Gradle plugin changelog

## Unreleased

## 0.4.0 - 2026-02-25

### Added

- Some release notes

Additional note for customers.

Structured info:

1. **L1** - text
2. **L2** - text
3. **L3** - text

## 0.3.0 - 2026-02-24

### Changed

- Introduce breaking changes

| Before | After       |
|--------|-------------|
| `test` | `test test` |
      

After running patchChangelog it remove everything that not related to predefined sections.

Describe the solution you'd like
Keep additional text without changes