chore: golf using grind. add grind annotations.

[euprunin]

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Trace profiling results (shown if ≥10 ms before or after):

• Finset.filter_product_card: 39 ms before, 114 ms after
• Finset.sym2_eq_image: 13 ms before, 67 ms after
• List.sublist_iff_exists_fin_orderEmbedding_get_eq: 125 ms before, 148 ms after
• Equiv.Perm.isThreeCycle_swap_mul_swap_same: 51 ms before, 79 ms after
• Polynomial.gaussNorm_monomial: 12 ms before, 12 ms after 🎉

This golfing PR is batched under the following guidelines:

• Up to ~5 changed files per PR
• Up to ~25 changed declarations per PR
• Up to ~100 changed lines per PR

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[github-actions]

PR summary 790901a8c9

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).

[euprunin]

!bench

[leanprover-radar]

Benchmark results for 9cb9eeb against 790901a are in! @euprunin

No significant changes detected.

[vihdzp]

All new grind annotations seem quite reasonable, and all the golfs are quite substantial. Thank you!