fix: harden input parsing in component_requirements hint module

Currently we silently ignore when the original component is not found
in a hope we can provide at least some meaningful hint. As it turned
out it's not true. Instead of providing misleading hint, just return
error. This adds several checks for situations, which should not happen,
but when they do it should be easier to identify the root cause of the
problem.

For example when hint module received malformed output with extra new
lines, e.g. caused by a bug in RunTool, it wrongly reported the original
component as source component.

This should also fix the tests on Windows.

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>

tools/test_idf_py/test_hints.py

@@ -149,7 +149,7 @@ class TestNestedModuleComponentRequirements(unittest.TestCase):
         self.projectdir.mkdir(parents=True)
         (self.projectdir / 'CMakeLists.txt').write_text((
             'cmake_minimum_required(VERSION 3.16)\n'
-            f'set(EXTRA_COMPONENT_DIRS "{components}")\n'
+            f'set(EXTRA_COMPONENT_DIRS "{components.as_posix()}")\n'
             'set(COMPONENTS main)\n'
             'include($ENV{IDF_PATH}/tools/cmake/project.cmake)\n'
             'project(foo)'))
@@ -164,7 +164,7 @@ class TestNestedModuleComponentRequirements(unittest.TestCase):
         # when components are nested. The main component should be identified as the
         # real source, not the component1 component.
         output = run_idf(['app'], self.projectdir)
-        self.assertNotIn('BUG: esp_timer.h found in component esp_timer which is already in the requirements list of component1', output)
+        self.assertNotIn('esp_timer.h found in component esp_timer which is already in the requirements list of component1', output)
         self.assertIn('To fix this, add esp_timer to PRIV_REQUIRES list of idf_component_register call', output)
 
     def tearDown(self) -> None: