fix(ci): Change approach in listing the changed boards

[P-R-O-C-H-Y]

Description of Change

Changed the way to get the modified lines in boards to make the script work for PRs with more changes to boards.txt file, as the "Patch" in json is missing if there is a lot of lines changed.

Tests scenarios

Tested script locally.

Related links

[github-actions]

	Messages
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