Make project level cli work inside subdirectory (#531)

[Galileo-Galilei]

Description

• Fix a bug which prevents importng the CLi with kedro==0.19.4 because I relied on private _is_project.
• On the way, make all project level CLI (init, ui, and modelify) work inside a subdirectory and not only at the root of kedro level

Development notes

• Create my own _is_project and _find_kedro_project functions which manges the import of the private functions of kedro.
• Change all CLI to get the project path with _find_kedro_project instead of taking Path.cwd.

Checklist

• Read the contributing guidelines
• Open this PR as a 'Draft Pull Request' if it is work-in-progress
• N/A Update the documentation to reflect the code changes
• Add a description of this change and add your name to the list of supporting contributions in the CHANGELOG.md file. Please respect Keep a Changelog guidelines.
• Add tests to cover your changes

Notice

• I acknowledge and agree that, by checking this box and clicking "Submit Pull Request":

• I submit this contribution under the Apache 2.0 license and represent that I am entitled to do so on behalf of myself, my employer, or relevant third parties, as applicable.

• I certify that (a) this contribution is my original creation and / or (b) to the extent it is not my original creation, I am authorised to submit this contribution on behalf of the original creator(s) or their licensees.

• I certify that the use of this contribution as authorised by the Apache 2.0 license does not violate the intellectual property rights of anyone else.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.90%. Comparing base (70a9002) to head (b164a34).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #539   +/-   ##
=======================================
  Coverage   99.90%   99.90%           
=======================================
  Files          29       29           
  Lines        1008     1021   +13     
=======================================
+ Hits         1007     1020   +13     
  Misses          1        1           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.