@azure/arm-containerservice_25.3.0-beta.1

Bump @azure/arm-containerservicesafeguards to 1.0.0-beta.2 (#38640)

This PR bumps `@azure/arm-containerservicesafeguards` from
`1.0.0-beta.1` to `1.0.0-beta.2`.

Version 1.0.0-beta.1 was already published but source files were
modified since the release tag. The release pipeline's "Check package
version" step requires a version bump before re-releasing.


https://dev.azure.com/azure-sdk/internal/_build/results?buildId=6338122&view=logs&j=b70e5e73-bbb6-5567-0939-8415943fadb9&t=8dd92614-7454-569d-3061-0c20dc3c788d&l=92

### Changes
- **package.json** — version `1.0.0-beta.1` → `1.0.0-beta.2`
- **CHANGELOG.md** — added new `1.0.0-beta.2 (Unreleased)` section
- **src/api/containerServiceContext.ts** — updated userAgent version
constant