Fix password validation exception for FIPS
What does this MR do and why?
When the password is less than 8 characters, OpenSSL Fips will raise
error on OpenSSL::KDF.pbkdf2_hmac. This commit fixes it by not
assigning value when the password value is less than 8 characters
Relates to https://gitlab.com/gitlab-com/request-for-help/-/issues/3526
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