Ci/add concurrency-add back feature template

[PProfizi]

Adding concurrency to workflow runs so that a commit to a PR will run the associated workflows while cancelling the ones still running from the previous commit. Same for pushes to tagged branches.

Also adding back the feature issue template. Apparently having a custom bug.yml meant the organization's template for feature was not used either.

[codecov]

Codecov Report

Merging #262 (14c981d) into master (b305f87) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   85.76%   85.76%           
=======================================
  Files          52       52           
  Lines        5704     5704           
=======================================
  Hits         4892     4892           
  Misses        812      812           

[cbellot000]

@PProfizi what do that mean?

[PProfizi]

@cbellot000

When a concurrent job or workflow is queued, if another job or workflow using the same concurrency group in the repository is in progress, the queued job or workflow will be pending. Any previously pending job or workflow in the concurrency group will be canceled. To also cancel any currently running job or workflow in the same concurrency group, specify cancel-in-progress: true.

see here
It means committing to your PR will cancel an already running workflow for the same PR.
When you work like me and make frequent commits, you often get the same workflow running multiple times in parallel, once for every commit, instead of just for the latest commit.