feat(release): allow for overriding npm dist tag (#9899)
### Description
Npm requires all published versions to have a dist tag. If we want to
backport a fix we don't want to release this under the `latest` or
`canary` tag. Instead we should release it under a `v${SPECIFIC_MINOR}`
tag if we want to cut another patch under an old version (or
`v${SPECIFIC_MAJOR}` for a minor release for a previous major)
This updates what we write to `version.txt` which is what gets used for
our [NPM
publish](https://github.com/vercel/turborepo/blob/main/cli/Makefile#L2).
### Testing Instructions
[`prepatch` release without an
override](https://github.com/vercel/turborepo/actions/runs/13144407776/job/36679014437#step:5:12)
[`prepatch` release with an
override](https://github.com/vercel/turborepo/actions/runs/13144412891/job/36679032662#step:5:12)
