fix function job, add more logs in middleware

[Anmol1696]

This pull request introduces enhanced logging and configuration flexibility for both the send-email-link and knative-job-fn services. The main improvements are better observability of job requests and error handling in knative-job-fn, and added support for custom host headers in GraphQL client creation in send-email-link. These changes aid in debugging, traceability, and deployment flexibility.

Enhanced logging and observability in knative-job-fn:

• Added middleware to log incoming job requests, including relevant headers and a snapshot of the request body, improving traceability and debugging of job invocations.
• Added logging when a job function completes, capturing worker, job, and database IDs along with the status code.
• Improved error logging by capturing and outputting detailed error context, including headers, error message, stack trace, and GraphQL response details if available.

GraphQL client configuration improvements in send-email-link:

• Modified createGraphQLClient to accept an optional environment variable name for the host header, allowing different host headers for different GraphQL endpoints.
• Updated GraphQL client instantiation to use the appropriate host header environment variables for both the main and meta GraphQL clients.

[Copilot]

Pull request overview

This PR adds comprehensive logging middleware to the knative-job-fn service and introduces support for custom host headers in the send-email-link function's GraphQL clients.

• Added request/response logging middleware to track incoming job invocations and their completion status
• Enhanced error logging to capture full error context including GraphQL response details
• Extended createGraphQLClient to support configurable host headers via environment variables

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
jobs/knative-job-fn/src/index.ts	Added three logging points: incoming request middleware, function completion logging, and enhanced error context logging for better observability
functions/send-email-link/src/index.ts	Modified createGraphQLClient to accept optional host header environment variable name, enabling separate host header configuration for main and meta GraphQL clients

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[Copilot]

The header extraction logic is duplicated between the request logging middleware (lines 24-29) and the error logging handler (lines 226-231). Consider extracting this into a shared helper function to improve maintainability and ensure consistency.