fix(init): clean up passwd and group files after init

[OsamaRab3]

Fix issue passwd and group file in user dir:

1. executeOnFabloDocker generates passwd + group in $FABLO_TEMP_DIR here
2. Mounts them into Docker container (lines 213-214)
3. initConfig copies everything from temp dir to working directory (line 262)
4. passwd and group end up in user's project

sol: delete files after copy

[mergify]

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