Fix binary fetching script

[FabijanC]

Usage related changes

• None

Development related changes

• The binary fetching script could so far only download the artifacts of latest main workflow, which is a problem if its commit message contains [skip ci]. Now it defaults to the latest successful main workflow, and also supports providing a workflow ID via scripts/fetch_ci_binaries.py --workflow <ID>.
• Readme also improved.

Checklist:

• Checked the relevant parts of development docs
• Applied formatting - ./scripts/format.sh
• No linter errors - ./scripts/clippy_check.sh
• No unused dependencies - ./scripts/check_unused_deps.sh
• Performed code self-review
• Rebased to the latest commit of the target branch (or merged it into my branch)
• Updated the docs if needed, including the TODO section
• Linked the issues which this PR resolves
• Updated the tests if needed; all passing (execution info)

[mikiw]

work perfectly, good job!