Auto merge of #129052 - onur-ozkan:better-incompatibility-check, r=Kobzol

detect incompatible CI rustc options more precisely

Previously, the logic here was simply checking whether the option was set in `config.toml`. This approach was not manageable in our CI runners as we set so many options in config.toml. In reality, those values are not incompatible since they are usually the same value used to generate the CI rustc. Now, the new logic compares the configuration values with the values used to generate the CI rustc, so we get more precise results and make the process more manageable.

r? Kobzol

Blocker for rust-lang/rust#122709

Author: bors