[ruby/prism] Improve comment generation in templates

The existing comment generation was hard to read and was making a lot of string manipulation. However, ERB files are already designed to do string manipulation, so we can use that instead.

So, instead of doing a split and a map, I opted to use the `#each_line` method to iterate over the lines of the file.

Also, in order to add an optional space padding at the beginning of the line, I opted to pad it with a space and to then right trim it. This makes sure that no space is left behind if the line is empty, but a space is added if the line is not empty.

https://github.com/ruby/prism/commit/5736711e70

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