[python] Fix immediate mode scheduling of BuildActions in iree.build (#20142)

When running the build action in the same thread we must still do a
start-finish to get an initialized completed future.

Signed-off-by: Boian Petkantchin <boian.petkantchin@amd.com>

Author: sogartar

compiler/bindings/python/iree/build/executor.py

@@ -677,6 +677,8 @@ def invoke():
             self.reporter.start_dep(dep)
             if dep.concurrency == ActionConcurrency.NONE:
                 invoke()
+                dep.start(concurrent.futures.Future())
+                dep.finish()
             elif (
                 dep.concurrency == ActionConcurrency.THREAD
                 or dep.concurrency == ActionConcurrency.PROCESS