fix: prevent inline toolbar from closing in nested instance of editor

[gorenburg]

Based on #2581

Closes issue with inline toolbar being closed in the nested editor instance when clicking on the toolbar button with some actions. The fix is taken from #2581; this PR adds cypress tests for the fix

[neSpecc]

Worked fine, thanks. Please, add a line to the changelog under the 2.30.6 section

[neSpecc]

There is an ESLint error:

/home/runner/work/editor.js/editor.js/test/cypress/support/utils/nestedEditorInstance.ts
   1:1   error    All imports in the declaration are only used as types. Use `import type`  @typescript-eslint/consistent-type-imports

[gorenburg]

There is an ESLint error:

/home/runner/work/editor.js/editor.js/test/cypress/support/utils/nestedEditorInstance.ts
   1:1   error    All imports in the declaration are only used as types. Use `import type`  @typescript-eslint/consistent-type-imports

was fixing it the same moment you added comment 😄

[gorenburg]

Ready to ship? 😀