fix(store/cachemulti): clone traceContext to prevent concurrent map panic

[djm07073]

Closes #25841

Summary

• Clone traceContext before passing to child stores in CacheMultiStore() to prevent concurrent map panic

Root Cause

cachemulti.Store.CacheMultiStore() passes traceContext map by reference to child stores via NewFromParent(). When multiple goroutines concurrently modify their child stores' traceContext, they all write to the same underlying map, causing fatal error: concurrent map writes.

Solution

Clone traceContext before passing to NewFromParent():

var traceCtx types.TraceContext
if cms.traceContext != nil {
    traceCtx = cms.traceContext.Clone()
}
return NewFromParent(cms.getCacheWrapper, cms.traceWriter, traceCtx)

To reproduce the panic (on the first commit):

git checkout baa5519660
cd store && go test -race ./cachemulti/... -run TestCacheMultiStoreTraceConcurrency
# fatal error: concurrent map writes

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