[flynt] add fix safety section (FLY002)

[VascoSch92]

The PR add the fix safety section for rule FLY002 (#15584 )

The motivation for the content of the fix safety section is given by the following example

foo = 1
bar = [2, 3]

try:
    result_join = " ".join((foo, bar))
    print(f"Join result: {result_join}")
except TypeError as e:
    print(f"Join error: {e}")

which print Join error: sequence item 0: expected str instance, int found

But after the fix is applied, we have

foo = 1
bar = [2, 3]

try:
    result_join = f"{foo} {bar}"
    print(f"Join result: {result_join}")
except TypeError as e:
    print(f"Join error: {e}")

which print Join result: 1 [2, 3]

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[dylwil3]

Thank you!