remove gam related code and tests

[eyvazahmadzada]

Type of change

• Bugfix

• Feature

• New bidder adapter

• Updated bidder adapter

• Code style update (formatting, local variables)

• Refactoring (no functional changes, no api changes)

• Build related changes

• CI related changes

• Does this change affect user-facing APIs or examples documented on http://prebid.org?

• Other

Description of change

Other information

[github-actions]

This PR introduces changes that may not work on all browsers. According to Babel, the following polyfills may be needed, and they are not automatically included:

• Changes to libraries/intentIqUtils/iiqPerfAgent.ts may need:
  • es.array.includes
  • es.array.push
  • es.iterator.constructor
  • es.iterator.filter
  • es.iterator.for-each
  • es.iterator.map
  • es.iterator.reduce
  • es.json.stringify
  • esnext.iterator.constructor
  • esnext.iterator.filter
  • esnext.iterator.for-each
  • esnext.iterator.map
  • esnext.iterator.reduce
  • esnext.json.parse

The best way to address this is to provide good test coverage, as normal PR checks run unit tests on older browsers.