chore(GroupTheory/GroupAction/Hom): improve to_additive use

[JovanGerb]

This PR cleans up after #34249, replacing some uses of to_additive existing with just to_additive. The fields of MulDistribMulAction had to be reordered in order to align with the additive version DistribMulAction.

This is an adaptation for the overlapping instances linter (#38126)

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[github-actions]

PR summary 05475cac70

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ instance : One (A →*[M] A)
+ instance _root_.DistriMulActionHom.instZero {A : Type*} [AddMonoid A] [DistribMulAction M A]
+ instance {A : Type*} [AddMonoid A] [DistribMulAction M A]
- DistribMulAction.instFunLike
- DistribMulActionHomClass
- _root_.DistribMulActionHom.comp
- _root_.DistribMulActionHom.id
- _root_.DistribMulActionHom.inverse
- _root_.DistribMulActionSemiHomClass.toDistribMulActionHom
- instance [AddMonoid A] [DistribMulAction M A] [AddMonoid B] [DistribMulAction N B] :
- instance [Monoid A] [MulDistribMulAction M A] : One (A →*[M] A)
- instance _root_.DistriMulActionHom.instZero

You can run this locally as follows

## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[vihdzp]

Otherwise LGTM.