perf(ModelTheory/Algebra/Ring/Definability): re-squeeze a slow simp

[grunweg]

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Second version of #20120, but against mathlib master now.

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The previous version didn't build, perhaps this is fine now.

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[github-actions]

PR summary 4ace4722e0

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[Ruben-VandeVelde]

Please add a comment in the source that this is for perf reasons

!bench

[grunweg]

!bench

[leanprover-bot]

Here are the benchmark results for commit 4ace472.
There were no significant changes against commit 01b6f1b.

[github-actions]

No benchmark entry differed by at least +1.0⬝10⁹ instructions.
CI run