(EAI-1149, EAI-1259) Updates to user message front matter

[hschawe]

Jira:

• https://jira.mongodb.org/browse/EAI-1149
• https://jira.mongodb.org/browse/EAI-1259

Changes

• Normalize URL in message formatting so that the LLM doesn't have to handle parsing and passing really long URLs as tool args (cases when there's long query strings, hash fragments)
• Adds labels to origin rules for formatting front matter in a more maintainable manner

[mongodben]

logically this seems correct, but i suspect there's a more efficient way to do this without the filter, forEach, and casting with as string.

for instance, i think you could precompute a map of originCodeLabels, where it's like:

interface OriginCodeLabels {
  [code: string]: string // the label
}

// ex: 
const originCodeLabels = {
  GEMINI_CODE_ASSIST: "Gemini Code Assist",
  VSCODE: "MongoDB VS Code extension"
}
// you can compute the above with `ORIGIN_RULES.reduce(...)`

then, in this location update your code to be:

const maybeOriginLabel = originCodeLabels[parsedCustomData.originCode]
if (maybeOriginLabel) {
  frontMatter.client = maybeOriginLabel
}

[mongodben]

pls add test(s) for this new behavior

[mongodben]

generally looks good, small back 2 u

[mongodben]

lgtm w/ small suggestion