Fix behavior for yarn version pre* to match the docs

[ClementValot]

What's the problem this PR addresses?

Resolves #5902

The behavior for yarn version prepatch/preminor/premajor and yarn version prerelease did not match the documentation.
Respectively, preminor errored, and prerelease did not bump the prerelease number if used more than once.
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How did you fix it?

• prepatch/preminor/premajor were added to the accepted CLI arguments
• In case of prerelease on an already pre-release version, the semver bump was adapted to bump the current prerelease version instead of the stableVersion

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Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.