ci: use bonitasoft/actions pr-title-conventional-commits

[tbouffard]

This action better conforms to Conventional Commits and provides guidelines to help to fix wrong PR titles.

covers #422

[tbouffard]

✔️ title checked on edit and reopen with the "pull_request" event

ℹ️ It is not possible to test the "pull_request_target" event in this PR directly: the workflow must be merged to the target branch first.
With "pull_request_target" the workflow definition in the master branch is used, not the one of the PR This is the purpose of this event: use the code of the target branch to run the workflow, and then trust this code as the opposite of the code in a PR.
Tested here

• introduced the workflow with pull_request_target: ci: check that PR title follows Conventional Commits tbouffard/playground-release-drafter-and-gh-pages#90. No run
• after merge create a new PR, the workflow runs: ci: simplify build workflow trigger tbouffard/playground-release-drafter-and-gh-pages#91 (comment)

Using pull_request_target allow to create the comment, even if the PR is created from a forked repository. This is not very useful in this repository as we don't have a lot of external contributions. But this will be more important for the bonita-doc repository for instance.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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