[BUG]: Support switching Toolchain when using CMake

### Describe the bug

When using IDE Mode + CMake, we send some paths to CMake about where to find some tools like LD, AS and AR.
This is currently based on the initial toolchain that the compiler was configured with.

If the user chooses to switch to a different one, this is not taken into account.

Related code:
https://github.com/compiler-explorer/compiler-explorer/blob/main/lib/base-compiler.ts#L291

### Steps to reproduce

-

### Expected behavior

If the user manually submits `--gcc-toolchain=/some/other/path` via manual entry or compiler overrides, then the tool paths should change.

### Reproduction link

Not applicable

### Screenshots

Not applicable

### Operating System

_No response_

### Browser version

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