Use of TF_VAR variables modified results of `tests/examples` and
required setting different environment to run `tests/examples` and
`tests/examples_e2e` tests. No both can be run using the same
environment.
* added tag serial to mark tests to be run serially
* always run tests using loadgroup distribution to make use of serial tag
* added end-to-end tests for organization, not adding to custom constraints as the name has to be unique
* fixed granting custom roles created in the same module call
* Add end-to-end tests for project module
* Add inventory to data tests
* Add files to end-to-end test cases
* Review fixes - use named groups
---------
Co-authored-by: Ludovico Magnocavallo <ludomagno@google.com>
Add end-to-end tests (apply, plan, destroy) for examples.
When run, `tests/examples_e2e`:
1. Create an environment for tests to run (folder, project vpc network)
2. For each marked example (with `e2e` tftest directive), run apply, plan, destroy
3. Verify:
* no failure in apply
* empty plan after apply
* no failure during destroy
4. When all tests are done, destroy test environment
More details in `tests/examples_e2e/README.md`
