fix: rename from containerProtoImage to protoImageName

[adlerjohn]

Description

Fixes #10054

Completes renaming of variables started in #9854, specifically https://github.com/cosmos/cosmos-sdk/pull/9854/files#diff-76ed074a9305c04054cdebb9e9aad2d818052b07091de1f20cad0bbac34ffb52R382.

Big thanks to @evan-forbes for debugging this and proposing the correct fix.

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[tac0turtle]

wow, wonder if anyone uses this, if it wasn't noticed.