ENH: Add solution guidance to IntCastingNaNError message (#62838)

[ADITYA-kus]

This implements the error message improvement suggested by @mroeschke in issue #62838 .

closes #62838

The new error message provides actionable guidance by suggesting:

• Replace or remove non-finite values
• Use nullable integer type (Int64) that supports missing values

This helps beginners discover the proper pandas way to handle this common situation.

[mroeschke]

Thanks @ADITYA-kus