[Code app] Need to implement correct validation for file names in the code editor

[VolhaBazhkova]

EPAM AI DIAL chat version

0.23.0

What happened?

Preconditions:

1. Add code app form is open
2. Folder with source files is selected, code editor is displayed

Steps:

1. Click on Create file icon at the bottom of the code editor
2. Type new file name including restricted chars, e.g. File=,:;{}/%& and confirm renaming
   -> the file name is updated (bug), the name is red and file icon is changed to red sign
   

-> if to click on reload button, DIAL behaves like delete button is clicked (toast error, error in console, confirmation message for the deleting)
-> if to click on delete button, toast error appears + errors in console

Note issue2: the same issue if the file name contains a dot at the end
Note issue3: there is missed validation of 160 max symbols in file name

Expected: we need to implement the same behavior as for renaming chats:

1. restricted symbols are not allowed to be entered and pasted
2. dot at the end should be removed automatically
3. max file name is 160 symbols

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