Rename model_name and model_name_or_path parameters as model in all integrations

[ZanSara]

Related to deepset-ai/haystack#6534

Is your feature request related to a problem? Please describe.

As a user, I'd like to have a similar interface for each Generator (possibly for all components accepting a model name) to pass the model name

Describe the solution you'd like

We have discussed that parameters should be named as model but the most important point is to have consistency.

TODOs:

• Amazon Bedrock: chore!: Rename model_name to model in AmazonBedrockGenerator #220
• Cohere: chore!: Rename model_name to model in the Cohere integration #222
• GoogleAI: already correct
• Google Vertex: already correct
• Gradient: chore!: Rename model_name to model in the Gradient integration #228
• Instructor: chore!: Rename model_name_or_path to model in the Instructor integration #229
• Jina:chore!: Rename model_name to model in the Jina integration #230
• Llama.cpp: chore!: Rename model_path to model in the Llama.cpp integration #243
• Ollama: already correct
• Review all model cards & docs
• Review tutorials:
  • fix: update model_name to model in "Your First QA Pipeline with Retrieval-Augmentation" haystack-tutorials#270
• Review cookbook
• Review articles:
  • fix: update the jina article to reflect model_name parameter haystack-home#289