Rollup merge of #70087 - ecstatic-morse:remove-const-eval-loop-detector, r=RalfJung

Remove const eval loop detector

Now that there is a configurable instruction limit for CTFE (see #67260), we can replace the loop detector with something much simpler. See #66946 for more discussion about this. Although the instruction limit is nightly-only, the only practical way to reach the default limit uses nightly-only features as well (although CTFE will still execute code using such features inside an array initializer on stable).

This will at the very least require a crater run, since it will result in an error wherever the "long running const eval" warning appeared before. We may need to increase the default for `const_eval_limit` to work around this.

Resolves #54384 cc #49980
r? @oli-obk cc @RalfJung

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