electron-updater: `allowPrerelease = true` doesn't work when tag is not a valid input to `semver.prerelease()`

[nop33]

Problem

The algorithm that determines whether there is a new prerelease version available for download uses assumes that the tag name is the version and uses it as an input to semver.prerelease() to determine the prerelease channel (see here). This only works when the tag is in the format {num}.{num}.{num}-{prerelease}.{number} or with a v prefix. It doesn't work for any other prefix than v. For example, it is a very common case for monorepos to prefix their tags with the name of their apps/packages (as the changesets package does for example)

> semver.prerelease('1.0.0-rc.0')
[ 'rc', 0 ]
> semver.prerelease('v1.0.0-rc.0')
[ 'rc', 0 ]
> semver.prerelease('[email protected]')
null

Solution

When allowPrerelease = true, instead of using hrefTag as input to the semver.prerelease() function to determine the channel, it should get the version from the latest*.yml file of the release that has the tag hrefTag, just like it happens when allowPrerelease = false