chore(Geometry/Manifold/VectorBundle/MDifferentiable): golf using cus…

[grunweg]

…tom elaborators

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Split out from #30357.

[github-actions]

PR summary 94c81ed7d9

Import changes for modified files

Dependency changes

File	Base Count	Head Count	Change
Mathlib.Geometry.Manifold.VectorBundle.MDifferentiable	2234	2235	+1 (+0.04%)

Import changes for all files

Files	Import difference
6 files Mathlib.Geometry.Manifold.ContMDiffMFDeriv Mathlib.Geometry.Manifold.Riemannian.Basic Mathlib.Geometry.Manifold.VectorBundle.Hom Mathlib.Geometry.Manifold.VectorBundle.MDifferentiable Mathlib.Geometry.Manifold.VectorBundle.Riemannian Mathlib.Geometry.Manifold.VectorField.Pullback	1

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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/pr_summary/declarations_diff.sh <optional_commit>

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

The doc-module for scripts/pr_summary/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/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).