juj 0c45297475 Allow switching between overrides (#1588) ...

Previously, if one used e.g. command

```
emsdk install --override-repository emscripten-main-64bit@https://github.com/juj/emscripten/tree/my_own_emscripten_branch emscripten-main-64bit
```

then the overridden installation would create a git clone from
`juj/emscripten`, and that clone would be located under the default
remote name `origin`.

This would prevent being able to switch between overrides on subsequent
`emsdk install` commands. I.e. it would then not be possible to later do
a default

```
emsdk install emscripten-main-64bit
```

command without an override, since the remote name `origin` would point
to `juj/emscripten` instead of `emscripten-core/emscripten`.

This PR changes the naming scheme of `git clone`s when
`--override-repository` is used, to name the clones with remote names
from the override, so in the above case, the clone would appear under
remote name `juj` and not `origin`.

This enables flipping between multiple `emsdk install` commands in the
same checkout, without needing to nuke the installed directory in
between.

This enables me to run experiments like
github.com/emscripten-core/emscripten/pull/25025 locally on my CI,
without needing to merge them upstream to become available.

2025-08-27 14:59:01 +03:00

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