Fixes #27038.
Previously, for NPM packages the latest version was the version with the
"latest" tag. For JSR packages, the latest version was the greatest
version that matched a `*` version requirement. Unfortunately, that
doesn't work well with pre-release versions.
This PR changes it so that the latest version is always > the currently
requested version.
For NPM: if "latest" tag > current then "latest" tag; otherwise the
greatest version that is >= current
For JSR: greatest version >= current
This is the most reasonable behavior I could come up with. For example,
```
versions:
2.0.0-beta.2
2.0.0-beta.1
1.0.0 => "latest" tag
with a version req `^2.0.0-beta.1`
previously:
"Update" column => 2.0.0-beta.2
"Latest" column => 1.0.0
now:
"Update" column => 2.0.0-beta.2
"Latest" column => 2.0.0-beta.2
```
