Revert "Use tempdir() to store heap snapshot files instead of abspatc…

…h ~= rootdir (#50026)"

This reverts commit 877b368.

stdlib/Profile/src/Profile.jl

@@ -1234,7 +1234,7 @@ function take_heap_snapshot(filepath::String, all_one::Bool=false)
     return filepath
 end
 function take_heap_snapshot(all_one::Bool=false)
-    f = joinpath(tempdir(), "$(getpid())_$(time_ns()).heapsnapshot")
+    f = abspath("$(getpid())_$(time_ns()).heapsnapshot")
     return take_heap_snapshot(f, all_one)
 end