Ketcher structure copy-paste in KET instead of MOL

[Zhirnoff]

Summary:
When copying a structure from Ketcher and pasting it into ChemDraw, instead of the expected molecular structure, a Ketcher text string (KET file, JSON string) is pasted. In some cases, ChemDraw returns an error indicating that the text is too long.
Note: On the previous version of Ketcher it copied as MOL file

Steps to Reproduce

1. Open Ketcher and draw any structure. (Benzene for example)
2. Copy the structure using Ctrl+C
3. Paste into Word for example by Ctrl+V
4. Observe pasted format

Actual behavior
Ketcher structure copy-paste in KET instead of MOL

Expected behavior
Ketcher structure copy-paste in MOL

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 131.0.6778.205 (Official Build) (64-bit)

Ketcher version
[Version 3.0.0-rc.6]
Indigo version
[Version 1.28.0-rc.3]

#188852421