Set stability tolerance based on installing module

[HebaruSan]

Problem

In KSP-CKAN/NetKAN#10325, two modules with prereleases are being updated, but validation is failing because it is installing the prerelease of one module alongside the regular release of the other, which causes file overwrites:

  File           : GameData/StarshipExpansionProject/Props/StarshipMFD/MainScreenAttitudeBlankSPDMODE.png
  Installing Mod : StarshipExpansionProjectIVA v.3.0.0-b2
  Owning Mod     : StarshipExpansionProject v.2.2.0 (installed 12/11/2024 02:07:16, auto-installed)
  CKAN Version   : v1.35.3+24345

In typical usage this would not happen because the overall prerelease setting would determine for both mods whether prereleases are available.
(A user who chooses to enable prereleases for just one of these two mods will have to learn to make better choices.)

Changes

Now when we install a mod, if it's a prerelease, then we enable all prereleases in the dummy instance. This will allow prereleases to be pulled in as dependencies when installing other prereleases.