Improve compatibility with Code-OSS

[getzze]

solves: https://github.com/jeanp413/open-remote-ssh/issues/163

The "release" part of the version is empty on Code-OSS, so the link to download VSCodium is wrong. Instead of having to modify the template url each time there is a new version of VSCode, this PR adds a vscodiumReleaseNumber setting to overwrite the release number (that can be found in the releases ).

Also the commit value in the product.json file on the remote host does not correspond to the Code-OSS commit, so it is updated with the correct value, to avoid a Version mismatch error.

Tested on linux local and remote.

EDIT: The "release" is now fetched automatically to the latest. The vscodiumReleaseNumber is only needed if you need a specific release that is not the latest. VSCode-OSS users only need to modify the following plugin settings:

"remote.SSH.experimental.modifyMatchingCommit": true,
"remote.SSH.experimental.serverBinaryName": "codium-server",