feat: add gov proposal execution for e2e testsuite

[colin-axner]

Description

See #2071 for passing test usage

closes: #2113

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[chatton]

LGTM 👍

[damiannolan]

Nice! Will we also need to support the new way of using gov proposal with v0.46?

[colin-axner]

Will we also need to support the new way of using gov proposal with v0.46?

Yea I think so, but those won't be backwards compatible for cross compatibility testing, so we can add that function for future usage when we start migrating our proposals to messages. Essentially we will just have duplicates of legacy and new for a while until we remove legacy as those versions no longer become supported