Support auto release note generation in CI

[yokawasa]

Description

1. Support auto release note generation in CI
2. no longer use action/create-release as it's been archived (no maintained any more), but use softprops/action-gh-release instead for automating release creation in CI

Test

I've setup dummy trigger in CI and I've tagged with dummy one v0.3.2-dummy and got an expected result like this:

• release url: https://github.com/st-tech/gatling-operator/releases/tag/v0.3.2-dummy
• action url: https://github.com/st-tech/gatling-operator/runs/4919563970?check_suite_focus=true

NOTE: I've changed the release to pre-release as it's dummy and planning to delete both the dummy release and tag after the PR is merged

[yokawasa]

@tmrekk121 thanks for the review! I'll merge the PR

[yokawasa]

FYI

I've deleted the following release and corresponding tags that I've created only for testing

• v0.3.2-dummy
• v0.3.2-dummy2