Add fallback to starters pull on kedro new

[lrcouto]

Description

During our current project creation and test setup, Kedro looks up to the kedro-starters repo and always uses the latest released version to get project templates. This can cause a problem during releases that depends on changes on the kedro-starters repo, as they won't be acknowledged by the current flow until after they are released.

This PR implements a fallback for when this situation happens. When the version of Kedro installed on your environment does not match the latest kedro-startersrelease, it will pull the main branch instead.

Development notes

Developer Certificate of Origin

We need all contributions to comply with the Developer Certificate of Origin (DCO). All commits must be signed off by including a Signed-off-by line in the commit message. See our wiki for guidance.

If your PR is blocked due to unsigned commits, then you must follow the instructions under "Rebase the branch" on the GitHub Checks page for your PR. This will retroactively add the sign-off to all unsigned commits and allow the DCO check to pass.

Checklist

• [ ] Read the contributing guidelines
• [ ] Signed off each commit with a Developer Certificate of Origin (DCO)
• [ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• [ ] Updated the documentation to reflect the code changes
• [ ] Added a description of this change in the RELEASE.md file
• [ ] Added tests to cover my changes
• [ ] Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team