feat: Refactor template lookup to use strategy pattern

[c-pius]

Description

Changes proposed in this pull request:

• refactors the template lookup to use a strategy pattern for looking up the module template info
  • previously we had lot's of branching depending on the module metadata (e.g., old or new data, installed via version or channel)
  • now we have dedicated strategies for each of those cases
    • each strategy determines itself whether it applies or not
    • if it applies, it can look up the module template info based for the case it covers
  • the aim is to make it easier to adapt the cases in the future (add, remove, refine)

💡 Note to reviewer

• this PR is huge (apologies), the actual changes are not that much though
• focus on the changes in templatelookup
  • the existing functionality has been moved from regular.go to the strategies in moduletempalteinfolookup
  • the business logic is just copied, no new functionality has been added
• the rest is boilerplate for setting up the strategies and adapting the changed method signatures in tests

Related issue(s)

• this is preparation for [Maintenance Windows] Skip module upgrades during maintenance window #2101

[lindnerby]

Nice job! Just left some mostly testing related suggestions 🙌