Add Sara and insurance and retail starter packs to regression test configs.

[kedz]

Description of Problem:
Add Sara, insurance-demo, retail-demo datasets to regression test configs after the following issue has been resolved.

Overview of the Solution:
Edit the dataset_config_mapping.json in the RasaHQ/training-data repo.
The modified Sara dataset should be:

    "Sara": {
      "path": "public/Sara",
      "language": "en",
      "domain": "domain.yml"
    },

the following should be added:

    "retail-demo": {
      "repository": "RasaHQ/retail-demo",
      "language": "en",
      "domain": "domain.yml",
      "train": "data",
      "test": "tests"
    },
    "insurance-demo": {
      "repository": "RasaHQ/insurance-demo",
      "language": "en",
      "domain": "domain.yml",
      "train": "data",
      "test": "tests"
    },

Examples (if relevant):

Blockers (if relevant):
the following issue

• waiting for updated Sara data PR to be merged which includes a domain.yml

Definition of Done:

• dataset_config_mapping.json is modified as specified above.
• Verify that the model regression tests continue to work with these two new test data sets

[kedz]

This blocking issue has been resolved. This can be implemented now. Still waiting on Sara training data PR to be merged (@samsucik 's comment below), which includes a domain.yml which is necessary to run core regression tests.

[samsucik]

Fyi I've added Sara as part of this training-data PR (waiting to be merged).

[alopez]

assignee: @kedz
reviewer: @aeshky

[kedz]

This requires updating following repos:

• retail-demo (PR) -- update domain to 2.8
• insurance-demo (PR) -- update domain to 2.8
• training-data (PR) -- update config to point to starter pack repos, depends on merging the first 2 PRs.

[kedz]

This issue has been resolved now that this PR has been merged. Working regression test results are here.