Make changes to maintainers or install scripts more prominent

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Feature description

Dependabot now helpfully flags when a dependency gets a new maintainer, or if install scripts change between versions.

Unfortunately I think these can be easily missed, especially as the important information is concealed behind a `` element.

I'd suggest:

- front-loading these indicators by moving them before the release notes / commit information
- not using ``, as the concealed information is both important and short
- potentially using GitHub's [markdown alerts](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts) to draw attention (exact severity level to be bike-shedded, I'm sure 😉)

It might look something like:

I can see a similar idea has been discussed in https://github.com/dependabot/dependabot-core/issues/12765#issuecomment-3900480964 for highlighting when a package loses provenance.

I'd be happy to contribute a change if this would be welcomed.

No file or test entry point is named. Start by locating the code that assembles Dependabot update pull request descriptions, then trace how maintainer-change and install-script indicators are rendered. Done means those indicators appear before release notes, are not hidden in a details element, and use an agreed GitHub alert style if adopted.

Written by the indexing model from the issue text.