Refactor Masp E2E tests #4578

Job	Run time
build-wasm (ubuntu-20.04, v2, 1.11.0)	4m 14s
namada-e2e (ubuntu-20.04, nightly-2023-06-01, 1.7.0, e2e, 0, namada, v2, namada-release (ubuntu-2...	2m 29s
namada-e2e (ubuntu-20.04, nightly-2023-06-01, 1.7.0, e2e, 1, namada, v2, namada-release (ubuntu-2...	2m 33s
namada-e2e (ubuntu-20.04, nightly-2023-06-01, 1.7.0, e2e, 2, namada, v2, namada-release (ubuntu-2...	3m 13s
namada-release (ubuntu-20.04, 1.11.0, ABCI Release build, namada-e2e-release, v2)	9m 16s
test-wasm (ubuntu-20.04, v2, nightly-2023-06-01, 1.11.0)	7m 41s
namada (ubuntu-20.04, nightly-2023-06-01, 1.11.0, ABCI, namada, v2, tendermint-unreleased-v0.1.4-...	10m 45s
update-wasm	0s
	40m 11s

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