Modify LLMCommandGenerator prompt to include possible categorical slot values - [ENG 607]

[varunshankar]

Proposed changes:

• The LLMCommandGenerator currently includes the allowed values of categorical slots only when an active flow is present. Adding the allowed values to the slots, at the time of defining the flows helps in the LLM mapping the input to one of the defined categorical values.
• Added e2e tests - https://github.com/RasaHQ/financial-demo-flows-llms/pull/50

Status (please check what you already did):

• [x] added some tests for the functionality
• [ ] updated the documentation
• [ ] updated the changelog (please check changelog for instructions)
• [x] reformat files using black (please check Readme for instructions)

[sonarcloud[bot]]

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4 Bugs
0 Vulnerabilities
2 Security Hotspots
54 Code Smells

0.0% Coverage
0.8% Duplication

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