ENH: Switch huggingface repo to point to our own

[AlexCK-STFC]

Change default model from Deepseek to Microsoft Phi, set a default context limit, and update vLLM

Requires stfc/cloud-helm-charts#87 to be merged first

[AlexCK-STFC]

We might also want to add a note to azimuth_capi_operator_app_templates_huggingface_llm_description warning users not to use DeepSeek or other models which are not allowed as per UKRI security policy.

But I can't actually find a list of models which are not allowed.
I've found this: https://ukri.sharepoint.com/sites/thesource/SitePages/DeepSeek-AI-security-notice.aspx#

But what about other models with similar security concerns?
For example, Qwen is a popular OpenSource model that is developed by Alibaba. Hunyuan is developed by Tencent. Are these allowed?

[AlexCK-STFC]

Also applied hotfix to disable monitoring, as it breaks deployment on services with monitoring disabled