[SDK/VM] - Rename dart_precompiled_runtime to dartaotruntime, ensures we have a uniform name for the executable between the build directories and the SDK directory

TEST=ci

Change-Id: I96ed52994e0d955300c18026032e68003504666d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/389760
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Siva Annamalai <asiva@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>

docs/Kernel-developer-notes.md

@@ -28,7 +28,7 @@ Run end-to-end tests using dartk + VM:
 
 Optionally (this is slow) run end-to-end tests using AOT:
 ```
-./tools/build.py dart_precompiled_runtime
+./tools/build.py runtime_precompiled
 ./tools/test.py -cdartkp -rdart_precompiled language co19
 ```