Prune upgrade handlers for 1.19

[Taztingo]

Summary

Go through upgrades.go and upgrades_test.go and remove unneeded handlers.

Problem Definition

The introduction of hardcoded navs that are used in the upgrade handlers have caused build times to increase significantly. A fresh build can result in a very long build time that lasts up to 10 minutes. This becomes even more of an issue because of how tightly coupled upgrades.go and app.go are, and a slight modification can cause a huge rebuild. Any changes to app.go will force us to compile all related units resulting in us rebuilding the navs after a slight change.

Proposal

• Delete unused upgrades and functions
• Delete unused navs

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