bindings: python: tests: selectively use f-strings

bindings: python: tests: selectively use f-strings

Since their inclusion in Python 3.6, f-strings have become the preferred
way to format strings with variable values as they are generally more
readable as the value substitution is in place and doesn't have to be
parsed from the list or arguments to `.format()`.

Where it does not impact readability (when the line is <120 characters),
swap usage of `.format()` to an f-string.

For lines that are not converted, inform the linter to ignore attempts
to upgrade those instances to f-strings [0]

[0]: https://docs.astral.sh/ruff/rules/f-string/

Signed-off-by: Vincent Fazio <vfazio@xes-inc.com>
Link: https://lore.kernel.org/r/20241114145116.2123714-23-vfazio@xes-inc.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>