TINY-13884: Disable source maps in bedrock's auto mode

[TheSpyder]

Related Ticket: TINY-13884

Description of Changes:

• The source map can be huge, and we don't need it for bedrock-auto (except in old edge cases we don't use anymore)

Pre-checks:

• Changelog entry added
• package.json versions have not been changed (done by Lerna on release)
• Tests have been added (if applicable)

Before merging:

• Ensure internal dependencies are on appropriate versions
  • For stable releases, all dependencies must be stable
  • For release candidates, all dependencies must be release candidates or stable