Add support for more LLMs

[NeonDaniel]

Description

Add claude, gemini, and palm LLM charts and configuration Update MQ deployments to support multiple mounted secrets for Google API compat. Add base personas for added LLMs to test Update backend deployment script to include new LLM services config

Issues

Other Notes

Needs:

• https://github.com/NeonGeckoCom/neon-llm-palm2/pull/2
• https://github.com/NeonGeckoCom/neon-llm-gemini/pull/2
• https://github.com/NeonGeckoCom/neon-llm-gemini/pull/1
• https://github.com/NeonGeckoCom/neon-llm-claude/pull/2
• https://github.com/NeonGeckoCom/neon-llm-claude/pull/1