Add outputs for awsnuke

What's Changed

Creating three dynamically generated outputs which will then be passed to the autonuke script via GitHub Actions Secrets

• environment_nuke_accounts: all sandbox accounts which are not explicitly annotated with "nuke" : "exclude" in the environment json file
• environment_rebuild_after_nuke_accounts: list of accounts to be rebuilt after autonuke completes. Annotated with "nuke": "rebuild" in the environments json files
• blocklist_nuke_accounts: all preproduction, production and core accounts.

Additional Changes

• Added the CODEOWNERS file to identify modernisation platform by @SteveLinden in #15
• Add dependabot and compliance badge by @davidkelliott in #16
• Fix formatting by @davidkelliott in #17
• Added static analysis file to workflows by @ep-93 in #18
• Update README.md by @davidkelliott in #19
• Github actions security improvements by @davidkelliott in #21
• Create scorecards.yml by @davidkelliott in #22
• Bump actions/upload-artifact from 3.1.0 to 3.1.1 by @dependabot in #24
• Bump github/codeql-action from 2.1.27 to 2.1.35 by @dependabot in #25
• Add new outputs for Autonuke by @julialawrence in #23

New Contributors

• @SteveLinden made their first contribution in #15
• @ep-93 made their first contribution in #18
• @dependabot made their first contribution in #24
• @julialawrence made their first contribution in #23

Full Changelog: v4.0.0...v5.0.0