feat: use realizeConst for all equation, unfold, induction, and partial fixpoint theorems

[Kha]

This PR ensures all equation, unfold, induction, and partial fixpoint theorem generators in core are compatible with parallelism.

Stacked on #7247

[leanprover-community-bot]

Mathlib CI status (docs):

• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 2e66341f69a0db9ef8b8e5255d0f0cfa73cdadc1 --onto 727c696d9f132bc2701b9755f8819bd36335cd26. (2025-02-27 21:00:11)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase ad5a746cdd6c29a47952fc38d6e256ad4071f57e --onto 727c696d9f132bc2701b9755f8819bd36335cd26. (2025-02-28 16:24:17)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase ad5a746cdd6c29a47952fc38d6e256ad4071f57e --onto a86145b6bb2669e8864b04ef3f286dc57a4aaef0. (2025-03-02 13:51:18)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase ad5a746cdd6c29a47952fc38d6e256ad4071f57e --onto e3c6909ad593e5a966a449df5e92abb1f0dbc317. (2025-03-03 10:35:25)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase e7a411a66df1c3f83d3499891616770851e4e5be --onto e3c6909ad593e5a966a449df5e92abb1f0dbc317. (2025-03-03 12:42:10)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 0a55f4bf363843b262ea04cdc0137f125d616ff4 --onto e3c6909ad593e5a966a449df5e92abb1f0dbc317. (2025-03-03 13:17:46)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase a244b0688244a0b9036fc2f14e63c1368bbdd94c --onto e3c6909ad593e5a966a449df5e92abb1f0dbc317. (2025-03-03 13:47:39)