CI/CD pipeline scripts for Github actions and Gitlab to update Spektate storage

[samiyaakhtar]

Right now, bedrock-cli generates bash script for the pipelines to update Spektate storage only for AzDO pipelines. Spektate repository has no documentation on finding these scripts if a user is not using bedrock-cli, or they're using a tool other than AzDO.

• Docs on pipeline scripts for Github actions, Gitlab and AzDO
• Add support to bedrock cli to generate pipelines for Github actions
• Add support to bedrock cli to generate pipelines for Gitlab