feat: SRVTRI-3123 Add defaultPostSort option

[kaga]

See https://linz.slack.com/archives/C044T4WFFT4/p1724976207632129

Add a new optional parameter defaultPostSort to override post sort behavior (new item to last), default to true.

Author Checklist

• appropriate description or links provided to provide context on the PR
• self reviewed, seems easy to understand and follow
• reasonable code test coverage
• change is documented in Storybook and/or markdown files

Reviewer Checklist

• Follows convention
• Does what the author says it will do
• Does not appear to cause side effects and breaking changes
  • if it does cause breaking changes, those are appropriately referenced

Post merge

• Post about the change in #lui-cop

Conventional Commit Cheat Sheet:
build: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
ci: Changes to our CI configuration files and scripts (example scopes: Circle, BrowserStack, SauceLabs)
docs: Documentation only changes
feat: A new feature
fix: A bug fix
perf: A code change that improves performance
refactor: A code change that neither fixes a bug nor adds a feature
test: Adding missing tests or correcting existing tests

[matttdawson]

LGTM

[github-actions]

🎉 This PR is included in version 21.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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