fix(gnovm): track block item allocations in PrepareNewValues

[omarsy]

Summary

• Fix GC allocation/recount mismatch that causes "should not happen, allocation limit exceeded while gc." panic during infinite recursion
• Root cause: PrepareNewValues appends block items without calling AllocateBlockItems, so GC recount exceeds alloc.bytes
• Add AllocateBlockItems call before appending to block.Values in PrepareNewValues
• Fix pre-existing nil pointer panic in GetLocalIndex debug logging

Test plan

• New filetest alloc_12.gno verifies infinite recursion triggers correct "allocation limit exceeded" error
• Updated gas test values for const.gno, nested_alloc.gno, slice_alloc.gno
• Full go test ./gnovm/pkg/gnolang/ passes
• ADR included at gnovm/adr/prxxxx_fix_gc_alloc_mismatch.md

Note: AI assisted PR — see ADR for detailed analysis.

[Gno2D2]

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[davd-gzl]

Are there any other similar vulnerabilities in the code-base?