Skip load balancer spec to fix broken master

What does this MR do and why?

Related to gitlab-org/quality/engineering-productivity/master-broken-incidents#121 (closed)

How to set up and validate locally

Run the following specs

bin/rails rspec --order defined spec/lib/gitlab/database/load_balancing/transaction_leaking_spec.rb spec/initializers/load_balancing_spec.rb

This will fail before this MR. It looks like the first spec is not resetting the state of the specs

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.