Remove unused code

[rnc]

Follow on from #474

[ligangty]

@shokakucarrier Can you help check if this will bring some impact on indy code?

[shokakucarrier]

@ligangty yes it does, indy reference them in code base, we will have to adjust indy for that

[rnc]

@shokakucarrier Should this be done as part of MMENG-4564 ?

[shokakucarrier]

@shokakucarrier Should this be done as part of MMENG-4564 ?

I guess we should, I thought remove only the dependency part of galley would be enough, but since we are going to remove o11yphant from all repo now we will have to trim down codes like this.