Converts 3 components into elements (#94589)

## About The Pull Request

`adjust_fishing_difficulty` is a good one to make into a bespoke element
since a number of the same clothing item are created in the wardrobe
system.

climb_walkable is also good due to how prevalent it is, and it is a bit
of a two for one since it also removes the need for the
`/component/connect_loc_behalf`

Also stops adding the on_climbable trait to literally everything in the
turf, it now only applies it to atoms with density. So no more pipes and
stuff getting trait lists created for no reason.

<details><summary> Tested + things still work as before </summary>

<img width="422" height="122" alt="image"
src="https://github.com/user-attachments/assets/b23696f5-cd16-4150-aeb3-14ea6bd256fc"
/>

</details>

## Why It's Good For The Game

Lessens overhead, fixes a bug as well.

## Changelog

🆑
fix: fixes a pushed crate not removing on_climbable trait properly off
the mob standing atop it
/🆑

code/modules/reagents/chemistry/reagents/medicine_reagents.dm

@@ -1274,8 +1274,9 @@
 	. = ..()
 	affected_mob.remove_status_effect(/datum/status_effect/jitter)
 	if(affected_mob.has_dna())
-		var/list/mutations = affected_mob.dna.mutations || list()
-		affected_mob.dna.remove_mutation_group(mutations - affected_mob.dna.get_mutation(/datum/mutation/race), GLOB.standard_mutation_sources)
+		var/list/mutations = affected_mob.dna.mutations
+		if(LAZYLEN(mutations)) // Don't need to be doing this at all if there are no mutations
+			affected_mob.dna.remove_mutation_group(mutations - affected_mob.dna.get_mutation(/datum/mutation/race), GLOB.standard_mutation_sources)
 		affected_mob.dna.scrambled = FALSE
 
 /datum/reagent/medicine/antihol