Make Biome and Structure Modifiers not crash when attempted to be re-applied

[TelepathicGrunt]

Basically, the modifiers already know if a biome or structure was modified and ideally should just no-op instead. It doesn't make sense to throw an exception when the exception isn't really helping anyone or preventing any error. Even Commoble, when asked, said there wasn't any strong reason for the exception either

So let's just remove the exception and the modifier do nothing if object was already modified. Basically cleanup. Might allow for more niche use case for the modifiers but they have other issues to deal with on their own when recycling registries. Just NeoForge should be one less roadblock

Closes #431

[neoforged-pr-publishing]

• Publish PR to GitHub Packages

Last commit published: 123a3bc0bc6ef90fcb3e60c6a3efc285afb73e4d.

PR Publishing

The artifacts published by this PR:

• 📦 net.neoforged:testframework:21.1.59-pr-1545-RecycledModifiers
• 📦 net.neoforged:neoforge:21.1.59-pr-1545-RecycledModifiers

Repository Declaration

In order to use the artifacts published by the PR, add the following repository to your buildscript:

repositories {
    maven {
        name 'Maven for PR #1545' // https://github.com/neoforged/NeoForge/pull/1545
        url 'https://prmaven.neoforged.net/NeoForge/pr1545'
        content {
            includeModule('net.neoforged', 'testframework')
            includeModule('net.neoforged', 'neoforge')
        }
    }
}

MDK installation

In order to setup a MDK using the latest PR version, run the following commands in a terminal.
The script works on both *nix and Windows as long as you have the JDK bin folder on the path.
The script will clone the MDK in a folder named NeoForge-pr1545.
On Powershell you will need to remove the -L flag from the curl invocation.

mkdir NeoForge-pr1545
cd NeoForge-pr1545
curl -L https://prmaven.neoforged.net/NeoForge/pr1545/net/neoforged/neoforge/21.1.59-pr-1545-RecycledModifiers/mdk-pr1545.zip -o mdk.zip
jar xf mdk.zip
rm mdk.zip || del mdk.zip

To test a production environment, you can download the installer from here.

[TelepathicGrunt]

Time to yolo it

[neoforged-releases]

🚀 This PR has been released as NeoForge version 21.1.65.