[Context-Generation] Do not show context action if a file exists in the destination folder

@bohdan-harniuk is already working on this.

Since Sep 6, 2022.

**Is your feature request related to a problem? Please describe.**

Now there are lots of context actions for generation different files. Once a new file is generated, we can see the same context action in the target directory as before generation. So we can click it more than one time with the error shown if the file already exists:

**Describe the solution you'd like** (*)

We cannot see context action if a target file already exists in the destination folder.

**Acceptance Criteria:**

- do not check file existence condition for each context action separately, check it on the abstraction layer

**Additional context**

**Mainline branch:** 4.4.1-develop