banking_stage: do not insert legacy vote ixs, refactor & unstaked (#2… #5025

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	2m 44s
ios (macos-12, aarch64-apple-ios)	3m 50s
android (ubuntu-20.04, aarch64-linux-android)	2m 49s
ios (macos-12, x86_64-apple-ios)	3m 32s
android (ubuntu-20.04, i686-linux-android)	2m 42s
ios (macos-12, aarch64-apple-darwin)	3m 29s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 6s
ios (macos-12, x86_64-apple-darwin)	3m 14s
error_reporting	0s
	25m 26s

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