divio / django-cms / #27485

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fix: JS issues with running CMS under cypress (#7591)

* fix: JS issues with running CMS under cypress

For the CMS to work under cypress like test automation tools, there were
some issues in JS. As CMS runs majorly in iframe, there are many places
in CMS where the JS is used to detect that. However, the detection
assumes that CMS itself is not run inside an iframe (which is common
when it is run from a test automation tool like cypress).
So in these cases, CMS got many crashes and was not able to do some
actions as the JS was not correct and it was trying to access the
`window.CMS`and `window.CMS.$` and `window.CMS.API`.

The fix basically checks all these cases and makes that these JS code
invoked only when CMS is run in the iframe from CMS and not when running
under cypress.

Authored-by: Vinit Kumar <vinit.kumar@kidskonnect.nl>
Signed-off-by: Vinit Kumar <vinit.kumar@kidskonnect.nl>

* fix: wrong if condition to check the CMS attributes

* fix: typo

* fix: codespell lint error

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Signed-off-by: Vinit Kumar <vinit.kumar@kidskonnect.nl>

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