test_plan_advice: Add .gitignore

Michael Paquier <michael@paquier.xyz>

Commit: ab697307dd0f0b4f6c6671421d4dd0bc20f176cb
Author: Michael Paquier <michael@paquier.xyz>
Date: 2026-03-18T02:04:10Z
test_plan_advice: Add .gitignore

Issue noticed while playing with the tree.

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