fix: (MCP ruler) unifying lint, format, check for python validation

[tychtjan]

JIRA: GDAI-996
risk: low

[tychtjan]

TLDR: added common variables (RUFF - path, ROOT_DIR) , fix naming scheme for commands, format and check are ortogonal = two separate commands (neither is subset of the other), project_common.mk for individual packages and Makefile for all.

Unified naming scheme - each command is supposed to do the thing they are named as.

Renamed format (check mode) to format-check for clarity
Removed duplicate import sorting step from format-fix (was running ruff check --fix --fixable I) since lint-fix does it automatically via the --fix tag.

Combined format and format-fix targets (both now run ruff format) = running either of commands changes the code (kept format-fix for mcp ruler). For checking use format-check

[tychtjan]

There is just one question:

format is set to be Checking only but the name is suggesting that it is formating
format-fix is set to be Formating and yes the name is suggesting that it is fixing formatting

So here the question is if even here i should do that the format command is Checking only, but is seems to be more intuitive to let format do Formatting (format-fix as well), and format-check will be Checking only

[tychtjan]

I answer the question by looking at the entire codebase, which uses

format = for checking
format-fix = to trigger the format

I fixed it as the rest of the repositories are.

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