Remove ignore rules for trigger.rb

This issue tracks the removal of the ignore rules in app/models/ci/trigger.rb

• Remove ignore rule for encrypted_token and encrypted_token_iv in 18.8 (MR already prepared !200795)
• Remove ignore rule for token column in 18.9 (MR already prepared !213925)

Blocked until 18.8 starts.

Will be completed in 18.9