Bump sec-scanners-config and kustomize file in create release workflow

[friedrichwilken]

Description

Changes proposed in this pull request:

• add option to have dry run releases, that are not published, to test the release workflow.
• remove publish release step; releases are now getting published only manually.
• create release bumps sec-scanner-config and kusomize file and creates a PR and waits for it to be merged.
• script to generate version from branch was copied to local repo.
• refactor scripts used in the release flow
  - adding comments
  - move all scripts to hack/ci
• remove scripts/check_sec-scanners-config.sh since it is no longer needed since we generate sec-scanners-config.yaml now.

Test
this was tested on this branch which is a 1:1 copy of the pr. Here is a successful release run (resulting in a draft release because of the set dry-run option). It produced and waited for this pr that bumped the afore mentioned files. Finaly, this is the resulting (unpublished) release with the changelog and all assets. Also: Release image in the registry

Related issue(s)

#361