chore: remove extraneous uses of push_neg

[grunweg]

---

Ideally, repeat this experiment after the new contrapose! for equivalences has been merged...

[github-actions]

PR summary b02af05520

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

+ Config
+ LogIfUnchanged

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.

---

Increase in tech debt: (relative, absolute) = (1.00, 0.33)

Current number	Change	Type
3	1	maxHeartBeats modifications

Current commit 511065bf3e
Reference commit b02af05520

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).

[mathlib4-merge-conflict-bot]

This pull request has conflicts, please merge master and resolve them.

[grunweg]

Closing in favour of #37937.