[minor] Add support for various SLS configurations

[rawa-resul]

Description

SLS related changes

• Added new SLS flow
  • Simplified
    • No 'ibm-sls' on cluster or differently namespaced ones: Same as usual, you are prompted for a license and SLS will be installed in 'ibm-sls' ns
    • 'ibm-sls' ns found: You are prompted if you want to upload a new license
  • Advanced
    • New
      • You can install a new SLS instance and are prompted for namespace
    • Existing
      • This option is only shown if we find SLS instances on the cluster.
      • After choosing an instance you are prompted if you want to replace the license file
    • External
      • You provide the sls_url, sls_registration_key and path to dir containing the ca.crt
      • Then a quick request is performed on the readiness endpoint
      • If check was 200 all good nothing will be shown, otherwise you are prompted if you want to proceed despite an unhealthy check
• License file secret is now created in the CLI within python/src/mas/cli/install/settings/additionalConfigs.py leveraging the self.addFilesToSecret function
• Extended the manualCertificates function within ``python/src/mas/cli/install/settings/additionalConfigs.pyto also create the SLS certificates (currently ca.crt) and store it within the mountedpipeline-certificates` secret
• Improved the slsSummary function to display variables depending on what SLS config has been chosen
• Added three new Validators: SLSConfigValidator, SLSInstanceSelectionValidator, and NewNamespaceValidator
• Added new params under python/src/mas/cli/install/argParser.py for external SLS
• Updated python/src/mas/cli/install/argBuilder.py to show SLS params based on config chosen
• Added/updated SLS parameters under various tekton yamls
• Separated out the DRO prompts within the configSLS as configDRO. Visually no change though.

Other changes

• --image-pull-policy arg is now also passed on to interactive mode. This will help with development work.
• Added argChecker.py which now holds functions to verify parameters beyond what argparse is capable of doing. For example creating argument dependencies or mutual exclusions.
• Added isValidDir function in argParser.py

ToDo's

• Update docs
• Lots of testing

Related PR's

• [minor] Add support for various SLS configurations ansible-devops#1619
• [minor] Add support for various SLS configurations python-devops#53

Testing

• In progress ...