Auto merge of #115898 - onur-ozkan:config-change-tracking, r=Mark-Simulacrum

bootstrap major change detection implementation

The use of `changelog-seen` and `bootstrap/CHANGELOG.md` has not been functional in any way for many years. We often do major/breaking changes but never update the changelog file or the `changelog-seen`. This is an alternative method for tracking major or breaking changes and informing developers when such changes occur.

Example output when bootstrap detects a major change:
![image](https://github.com/rust-lang/rust/assets/39852038/ee802dfa-a02b-488b-a433-f853ce079b8a)
This commit is contained in:
bors 2023-10-02 07:41:52 +00:00
commit f04620a508

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@ -31,7 +31,7 @@ index d95b5b7f17f..00b6f0e3635 100644
EOF EOF
cat > config.toml <<EOF cat > config.toml <<EOF
changelog-seen = 2 change-id = 115898
[llvm] [llvm]
ninja = false ninja = false