chore: Add product update templates

[NickLarsenNZ]

Description

Note

This started out as PR templates, but we need to be able to create them ahead of code changes.

These have been broken up from the old template which has the following problems:

• It covers every product in one issue, meaning the issue stays open for a long time and progress is difficult to visualise on the engineering board.
• Concurrent updates to the issue description across the team is buggy (eg: old changes reverted and replaced by new changes. Sometimes the description becomes locked as a result.
• Improving instructions on the old template means the description becomes even longer.

This change:

• Refactor the pre-release tracking issue with links to quickly create the issues from these templates.
• Splits up the product update issue templates per product or product group for easier tracking on the engineering board.
• Automatically adds issues to the engineering project board
• There are specific instructions per-product to help the person doing the updates work autonomously. These aren't perfect, but can be improved over time.

To consider:

• hello-world Added in a tasklist in pre-release for now
• krb5 Added in a tasklist in pre-release for now
• tools (and other misc items) Added in a tasklist in pre-release for now
• Moving ubi*-rust-builders out of the release process (they can be done as needed by developers or when SecObserve/Renovate recommend it).
• Revamping the existing PR template
• Issue template for tasks when adding a new product/base

[adwk67]

LGTM!