[Feature Request] Linux crash dump generation: Support creating both Minidump and Full Dump on a single crash event

### Description

Currently on Linux, the .NET crash dump infrastructure allows configuring a single dump type for crash dump generation (e.g., Minidump, Heap Dump, or Full Dump) through `DOTNET_DbgMiniDumpType` / `createdump` settings. However, there is no built-in mechanism to generate both a `Mini` dump and a `Full` dump for the same crash event.

For production services, both dumps are valuable:
- Minidump
- Smaller size
- Faster to upload for analysis
- Easier to attach to incidents and automated diagnostics workflows
- Full Dump
- Preserves complete process memory
- Enables deep root-cause analysis when minidump data is insufficient

Today, we can choose only one of the dump types.

### Requested Enhancement

Provide a supported mechanism to generate both a `Mini` dump and a `Full` dump from the same crash event.

Start by reading the Linux crash-dump implementation around createdump and the DOTNET_DbgMiniDumpType configuration mentioned in the issue. Determine where a single dump type is selected and identify the existing tests or entry points covering crash-event dump generation; done means a supported way to produce both Mini and Full dumps from one crash event.

Written by the indexing model from the issue text.