move the PlatformMethods generation from TransformExpectPlatform to RemapInjectables, where its used

[AnAwesomGuy]

so that i dont have a completely useless architectury_inject_blah_common_hashhashblahblah thing in my jar

p.s.: i dont really know how i would test this, so please dont kill me if it doesnt work properly

[CLAassistant]

All committers have signed the CLA.

[emyfops]

If you want to test it you can publish the artifacts to your local maven repository using gradle publishToMavenLocal and then in your arch project you put the artifact version (shown in the console) like this

allprojects {
    architectury {
        transformerVersion = "2.1.35"
    }
}

[emyfops]

Tests

All tests were made using Architectury Loom 1.7.412 using Java 17 on windows and linux

1.20.4 Fabric 0.15.11 ✅
1.20.4 Forge 49.1.4 ✅