Remove deprecated APIs for 1.1.0 release

[ilayaperumalg]

Remove deprecated constructors, methods, and classes scheduled for removal:

• Delete deprecated OllamaOptions class (replaced by OllamaChatOptions/OllamaEmbeddingOptions)
• Delete deprecated EmbeddingOptionsBuilder class
• Remove deprecated constructors from:
  • QuestionAnswerAdvisor
  • DeepSeekAssistantMessage
  • MistralAiChatModel, MistralAiEmbeddingModel, MistralAiModerationModel
  • MistralAiApi, MistralAiModerationApi
• Remove deprecated builder methods:
  • BedrockTitanEmbeddingOptions.Builder.withInputType()
  • OllamaChatModel.Builder.defaultOptions(OllamaOptions)
  • OllamaEmbeddingModel.Builder.defaultOptions(OllamaOptions)

Update all usages throughout codebase:

• Migrate AssistantMessage construction to builder pattern
• Replace EmbeddingOptionsBuilder with EmbeddingOptions.builder()
• Update OllamaOptions references to use specific option types
• Update vector stores and tests to use builder patterns

Update reference docs to fix the deprecations

[apappascs]

would it make sense to also remove the deprecated classes for TTS? I have the PR open with all related changes including documentation and migration guide:
#4814

[ilayaperumalg]

@apappascs Thanks the heads up! While your changes at #4814 make sense, we are yet to decide whether to bring in such breaking changes as we are so close to do 1.1.0 GA.

[apappascs]

@ilayaperumalg Totally understand the timing concern being so close to 1.1.0 GA.
The TTS changes in #4814 follow the same pattern you're applying here.. removing deprecated classes and migrating to the shared interface approach. Since we already have the shared TextToSpeechModel interface established and the OpenAI specific classes deprecated, it felt like a natural fit for the 1.1.0 cleanup.
That said, I'm happy to hold off if the team prefers to defer breaking changes.

[ericbottard]

LGTM although some removals where since=1.1.0 make seem like we're being a bit aggressive (but this doesn't mean others without the attribute weren't introduced in early 1.1.0 too)

[ilayaperumalg]

@apappascs we have decided to get your changes from #4814 in for 1.1.0.

[markpollack]

merged in c631340