feat(tests): add pytest-rerunfailures

[AlejandroSuero]

Proposed Changes

1. Added pytest-rerunfailures to dev/requirements
2. Modify entrypoint.sh to use and install pytest-rerunfailures
3. Added rerunfailures to .cspell.json

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[nvuillam]

I love this PR :)
Let's see if it has an impact on or sometimes failing for no reason pipelines ^^

[echoix]

It went into action in the auto update PR. Puppetlint test format fix got rerun 3 times and failed. Maybe using the default 5, or waiting more than 1 second between each retry might help (we have some tests that take a long time).

But the real fix would be to have our tests non-flaky. That's just a patch

[nvuillam]

@echoix as failures are often due to race conditions, indeed wait for more than one second could be relevant
I don't know how to make tests less flaky without removing the parallel testing and going back to the 1h PRs :/