Revert "fix(resolver): bypass cooldown for transitive deps when top-level pin exists

[LalatenduMohanty]

This reverts commit dcd8a84.

Why

#1153 (comment)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: d8c2ca68-dba3-4389-b947-eb7afa0050bf

📥 Commits

Reviewing files that changed from the base of the PR and between db8a160 and 3da081c.

📒 Files selected for processing (2)

• src/fromager/resolver.py
• tests/test_cooldown.py

💤 Files with no reviewable changes (2)

• src/fromager/resolver.py
• tests/test_cooldown.py

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📝 Walkthrough

Walkthrough

This PR simplifies the package cooldown bypass logic in the resolver. Previously, resolve_package_cooldown() would skip cooldown checks for transitive dependencies whenever a top-level exact version pin (==) existed elsewhere in the dependency graph. The implementation now restricts cooldown bypass to cases where the requirement being resolved is itself top-level with an exact pin. The corresponding test coverage for the transitive-dependency bypass behavior has been removed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: reverting a previous fix that bypassed cooldown for transitive dependencies.
Description check	✅ Passed	The description directly relates to the changeset by explaining this is a revert of a specific commit, with a reference to the issue discussion.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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