Ci/cleanup upgrade handler (#585)

* [Bug]: Fix calculate discount and add more tests (#570)

* add calculate discount test and bug fix

* get asset by denom

* ci: use post-upgrade-snapshot-generator (#571)

* ci: use post-upgrade-snapshot-generator

* ci: update delete snapshot CI to use post upgrade snapshot gen binary

* ci: clean up upgrade handler

* ci: use latest post upgrade snapshot gen version

* ci: update post upgrade snapshot gen version

* ci: cache snapshot

* ci: use latest version of snapshot gen

* ci: trigger software upgrade test and unit tests for develop, devnet and main branches

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Co-authored-by: Amit Yadav <[email protected]>