Refactor: select task versions based on the cached package data from API endpoint

[isoos]

• We are reading the Package and the PackageVersion list inside the transaction because the cached data may be obsolete when a new version is published. However, we can pass a flag that refreshes the cached data by ignoring the cache read, effectively doing not worse than before in this case, while having much lower transaction overhead in other cases.
• Updated the version selection to work on the PackageData version list, to re-do the Package object's latest prerelease/preview calculation. Here we won't need to have the current SDK version as part of this calculation, since the PackageData's latest version already considers it - every stable version after the current latest is preview.