chore: introduce script to create release

[j-luong]

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What does this PR do?

Introduces a script that can be used to create releases by checking for major/minor or patch changes and updating/creating branches as appropriate.

Where should the reviewer start?

Run the script ./release-scripts/create-release.sh to create/update the release branch.

How should this be manually tested?

If you want to test without creating any branches, then pass the dry-run arg to the ./release-script/create-release.sh script e.g. ./release-scripts/create-release.sh dry-run

Any background context you want to provide?

What are the relevant tickets?

Screenshots

Additional questions

[j-luong]

question: do we want to delete the old release/${manjor}.${minor} branch after pushing the new one?

[thisislawatts]

I do not think so, I believe there is value in those branches existing for a period of time after release as a target for hotfixes.

[thisislawatts]

question: What would be the steps required in this scenario to rectify the issue. Can we document them, either as part of this output or externally and link to them?