detach -> release

The C++ standard library uses the name "release" for the operation we call "detach".

Rewriting each "detach(" to "release(" brings us a step closer to using standard library types directly (e.g. std::unique_ptr instead of SkAutoTDelete).

This was a fairly blind transformation.  There may have been unintentional conversions in here, but it's probably for the best to have everything uniformly say "release".

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1809733002

Review URL: https://codereview.chromium.org/1809733002
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 6748544..d8421c9 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -315,7 +315,7 @@
         FLAGS_src.contains(tag) &&
         !SkCommandLineFlags::ShouldSkip(FLAGS_match, src->name().c_str())) {
         TaggedSrc& s = gSrcs.push_back();
-        s.reset(src.detach());
+        s.reset(src.release());
         s.tag = tag;
         s.options = options;
     }
@@ -791,7 +791,7 @@
     }
 
     TaggedSink& ts = gSinks.push_back();
-    ts.reset(sink.detach());
+    ts.reset(sink.release());
     ts.tag = config.getTag();
 }