Proposal: Test yaml for each component (#5398)

* Test for each component.

* When possible use commandline substitution.

* Add wildcard support.

* end file with new line.

* Move component tests into subfolder.

* Add component test to pipeline.

* Remove trailing whitespace.

* add restore python step.

* Add `. venv/bin/activate` to pipeline.

* step `changed-components` needs `common` step.

* start `list-components-changed.py` different.

* iterate on pipeline stage `list-components`.

* Update `checkout` action.

* Rename test folder from `tests` to `_test`.

* validate file exists.

* Move component test folder.

* extend list-components to include child components.

* File does not end with a newline

* Handle empty list-components matrix.

* list-components also check for changes in tests folder.

* Improve `list-components.py`.

* `*` is a forbidden character for filenames on windows.

---------

Co-authored-by: Your Name <you@example.com>
Co-authored-by: Keith Burzinski <kbx81x@gmail.com>

tests/test_build_components/build_components_base.esp32-idf.yaml

@@ -0,0 +1,20 @@
+esphome:
+  name: componenttestesp32idf
+  friendly_name: $component_name
+
+esp32:
+  board: nodemcu-32s
+  framework:
+    type: esp-idf
+
+logger:
+  level: VERY_VERBOSE
+
+packages:
+  component_under_test: !include
+    file: $component_test_file
+    vars:
+      component_name: $component_name
+      test_name: $test_name
+      target_platform: $target_platform
+      component_test_file: $component_test_file