Handle incorrect DCR code suggestions during interaction

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Currently, the chat experience of Duo Code Review on MergeRequest can end up creating a code suggestion that is not applicable to the current DiffNote position. Applying those incorrect suggestions, would make a mess as the code suggestion is not meant to be applied on that line.

Example: #501150 (comment 2336430176)

Possible solutions

1. Don't turn code blocks into a code suggestion if the first line of <from> tag is the same as the current line DiffNote is left on. <from> tag should contain the lines that needs to change so we could return a simple code block instead. Weight: 2
2. We could consider allowing Duo to leave those code suggestion on the line where it can be applied. I think that could be possible and perhaps more user friendly, but it would require more effort. Weight: 3 or more