feat(ldapauth): sanitize input for group search filter

[pafik13]

I get errors when the groupDnProperty value contains parentheses. I fix it locally with sanitizer.

Explain changes:

• I move sanitizeInput to the top of the file cause there was a linter error: 142:31 error 'sanitizeInput' was used before it was defined no-use-before-define
• I use || '' expression to avoid undefined values and error in sanitizeInput