Changes

debian-bookworm-build: add linting tools

Prepare for being able to run these linting tools in CI.

* clang-format gets used for osmo-asf4-dfu
* ruff gets used for testenv in osmo-ttcn3-hacks

Related: osmo-asf4-dfu I9768bc2590ca5306ee19d3276f0953c6b0b6f926
Related: osmo-ttcn3-hacks 157897523e54762ec3739cd7842c7b5f5d724ac2
Change-Id: I0a287b991a3efa50090587739529f95de32225bc