v3.1: runtime: Relax program data account check in migration (backport of #9891)

[mergify]

Problem

SIMD-0444 enables runtime-level program migrations when the target program data accounts is already funded, which currently it is not possible.

Summary of Changes

This PR adds a feature gate for SIMD-0444 and updates the migration validation to allow pre-funded program data accounts.

---

This is an automatic backport of pull request #9891 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5390905 has failed:

On branch mergify/bp/v3.1/pr-9891
Your branch is up to date with 'origin/v3.1'.

You are currently cherry-picking commit 5390905a3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   runtime/src/bank.rs
	modified:   runtime/src/bank/builtins/core_bpf_migration/mod.rs
	modified:   runtime/src/bank/builtins/core_bpf_migration/target_bpf_v2.rs
	modified:   runtime/src/bank/builtins/core_bpf_migration/target_builtin.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   feature-set/src/lib.rs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.64499% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.2%. Comparing base (cf659c3) to head (3264688).
⚠️ Report is 1 commits behind head on v3.1.

Additional details and impacted files

@@           Coverage Diff            @@
##             v3.1    #9998    +/-   ##
========================================
  Coverage    83.2%    83.2%            
========================================
  Files         865      865            
  Lines      376142   376458   +316     
========================================
+ Hits       313144   313484   +340     
+ Misses      62998    62974    -24     

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[t-nelson]

who needs to sme here? we want this in before tomorrow so it lands in the mb upgrade candidate