Move renovate pipeline to pipeline-templates

Move the .gitlab-ci.yml code to the BigBang pipeline template repo - https://repo1.dso.mil/platform-one/big-bang/pipeline-templates/pipeline-templates/-/tree/master/pipelines

This allows for easier reuse of templates between pipelines and helps to protect the pipeline from malicious changes.

Steps:

• Add current pipeline code to a branch in the pipeline template repo as a new pipelines/renovate.yaml file
• Test the pipeline by pointing to the new location in the .gitlab-ci.yml file, i.e.:

  include:
    - project: 'platform-one/big-bang/pipeline-templates/pipeline-templates'
      ref: your-pipeline-branch
      file: '/pipelines/renovate.yaml' 
  variables:
    PIPELINE_REPO_BRANCH: your-pipeline-branch 

• Once the pipeline is working properly open an MR to pipeline templates and get it merged
• Have someone with maintainer access to the renovate repo remove the .gitlab-ci.yml file and configure the CI file location via repo settings