BB-848 Fix Hyphen Issue with Branch Names

What

• Branch names where being truncated at weird lengths and causing issues in aws with naming rules
• This sets the branch name + commit name to be exactly 15 characters which prevents the truncation from effecting us
• Also sets spot instance to false to make the builds more reliable.
• Also increases the artifact expiration from 1 hr to 24 hrs.

Why

• So pipelines don't fail due to naming issues caused by truncation.

Related Link

• build of umbrella using these changes here