Support newer versions of MinecraftForge 1.20.2.

[shedaniel]

Not sure if that's the best place to put the MOD_CLASSES envvar.
Tested working with 48.0.17 and above.

Forge since 48.0.14 tests jars starting with "client-extra", this PR renames that jar, not sure if renaming the forge-client-extra.jar breaks older versions

Side Effect: This invalidates all current Forge projects, so I am not sure if we really want to rename this jar for everyone

[github-actions]

Test Results

  91 files   - 1      1 errors  90 suites   - 1   3h 21m 53s ⏱️ - 39m 22s
494 tests  - 1  493 ✔️  - 1  0 💤  - 1  1 ❌ +1 
501 runs  +3  500 ✔️ +3  0 💤  - 1  1 ❌ +1 

For more details on these parsing errors and failures, see this check.

Results for commit 9d37bb1. ± Comparison against base commit b6354a0.

This pull request removes 21 and adds 9 tests. Note that renamed tests count towards both.

 '
Fabric-Loom-Remap: broken
Fabric-Loom-Remap: false
Fabric-Loom-Remap: true
Something: Hello
], #1]
], #2]
], #3]
], #4]
…

net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ Should Remap [shouldRemap: false, entries: [fabric.mod.json:{}, META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: false

], #2]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ Should Remap [shouldRemap: false, entries: [hello.json:{}, META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: broken

], #6]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ Should Remap [shouldRemap: false, entries: [hello.json:{}, META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: false

], #4]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ Should Remap [shouldRemap: false, entries: [hello.json:{}, META-INF/MANIFEST.MF:Manifest-Version: 1.0
Something: Hello

], #7]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ Should Remap [shouldRemap: true, entries: [fabric.mod.json:{}, META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: true

], #3]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ Should Remap [shouldRemap: true, entries: [hello.json:{}, META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: true

], #5]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ remap requirements [requirements: OPT_IN, entries: [META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: true

], #2]
net.fabricmc.loom.test.unit.ArtifactMetadataTest ‑ remap requirements [requirements: OPT_OUT, entries: [META-INF/MANIFEST.MF:Manifest-Version: 1.0
Fabric-Loom-Remap: false

], #1]
net.fabricmc.loom.test.unit.StringsTest ‑ capitalize ' 
 '

♻️ This comment has been updated with latest results.