chore(RingTheory/Ideal/Norm/RelNorm): switch over to new definitions of ramificationIdx and inertiaDeg

[tb65536]

This PR switches the file RingTheory/Ideal/Norm/RelNorm.lean over to the new definitions of ramificationIdx and inertiaDeg.

---

[github-actions]

PR summary c71c87de96

Import changes exceeding 2%

%	File
+11.88%	Mathlib.RingTheory.DedekindDomain.Factorization

Import changes for modified files

Dependency changes

File	Base Count	Head Count	Change
Mathlib.RingTheory.DedekindDomain.Factorization	2155	2411	+256 (+11.88%)
Mathlib.RingTheory.Ideal.Norm.RelNorm	2426	2425	-1 (-0.04%)

Import changes for all files

Files	Import difference
Mathlib.RingTheory.Ideal.Norm.RelNorm	-1
Mathlib.AlgebraicGeometry.EllipticCurve.LFunction	114
5 files Mathlib.NumberTheory.Height.NumberField Mathlib.NumberTheory.NumberField.AdeleRing Mathlib.NumberTheory.NumberField.Completion.FinitePlace Mathlib.NumberTheory.NumberField.FinitePlaces Mathlib.NumberTheory.NumberField.ProductFormula	118
Mathlib.RingTheory.DedekindDomain.FiniteAdeleRing	141
Mathlib.Topology.Algebra.Ring.Compact	218
Mathlib.Algebra.Module.Torsion.PrimaryComponent Mathlib.RingTheory.DedekindDomain.Factorization	256

---

Declarations diff (regex)

+ IsDedekindDomain.ramificationIdx'_eq_factors_count
+ ramificationIdx_eq_ramificationIdx''

You can run this locally as follows

## from your `mathlib4` directory:
git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci

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

## more verbose report:
../mathlib-ci/scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh in the mathlib-ci repository contains some details about this script.

Declarations diff (Lean)

✅ Lean-aware diff — post-build, computed from the Lean environment (commit c71c87d).

• +2 new declarations
• −0 removed declarations

+Ideal.IsDedekindDomain.ramificationIdx'_eq_factors_count
+Ideal.ramificationIdx_eq_ramificationIdx''

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No changes to strong technical debt.

No changes to weak technical debt.

Current commit c71c87de96
Reference commit 571b8a8e54

This script lives in the mathlib-ci repository. To run it locally, from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci
../mathlib-ci/scripts/reporting/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).