merge with stable

resources: stop important a non existent FileNotFoundError The error was hidden by the wide try/except Differential Revision: https://phab.mercurial-scm.org/D11311

template: FileNotFoundError is actually a built in exception However it is python3 only. Differential Revision: https://phab.mercurial-scm.org/D11310

check-code: drop the camelcase checks Fro about 2 years we have been using CamelCase is class names. That rules gets in the way of assigning class or exception in compatibility layers. I think it is safe to drop it now that we started using CamelCase for some case. My motivation for this is the need to assign `FileNotFoundError` in `pycompat`. Differential Revision: https://phab.mercurial-scm.org/D11309

Added signature for changeset 53221078e0de

Added tag 5.9 for changeset 53221078e0de

pyoxidizer: always run the associated CI jobs Now that all tests are passing, we can enable this by default. Differential Revision: https://phab.mercurial-scm.org/D11306

pyoxidizer: skip for ZeroConf related test for now These test are failing for obscure reason. They are fairly minor and Since they are the only thing between us and enabling pyoxidizer testing in the CI by default, we just shallow the bad output for now. Differential Revision: https://phab.mercurial-scm.org/D11305

pyoxidizer: disable the test for disabled & broken extensions help The test is a bit fragile and the feature is significantly broken for 3rd party extension already. So we disable that section with a comment about why and what is needed. Differential Revision: https://phab.mercurial-scm.org/D11304

pyoxidizer: re-install PYTHONPATH behavior Hooks and extensions can rely on PYTHONPATH value. Yet the pyoxidized binary ignore the variable. So we manually reinstall the behavior to fix various tests and restore the expected behavior. This positively affects: - test-extension.t - test-hook.t Differential Revision: https://phab.mercurial-scm.org/D11302