fix(logger): remove timestamp from production log format

[sjinks]

Description

This pull request updates the logging format in the src/logger module to remove timestamps from production log output. Production log lines will now omit the timestamp, resulting in a simpler and more consistent log structure.

Logging format changes:

• The production log format in src/logger/index.ts no longer includes the timestamp in the output string; only the app, app_type, and the JSON-encoded log object are included.
• The corresponding test in __tests__/logger.spec.ts is updated to match the new log output format without the timestamp.

Why

Production logs already have a timestamp. By removing the timestamp from the message itself, we make it easier to filter out uninteresting duplicate log lines.

Steps to Test

Unit tests have been updated.

[Copilot]

Pull request overview

This pull request updates the src/logger module’s production log line formatting to omit the inline timestamp (since production log aggregation already provides timestamps), and adjusts unit tests accordingly.

Changes:

• Removed the timestamp prefix from production log output in src/logger/index.ts.
• Updated the production logging test assertion in __tests__/logger.spec.ts to match the new output format.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/logger/index.ts	Updates the production printf formatter to no longer prepend timestamp to log lines.
__tests__/logger.spec.ts	Updates the production log output regex to match the new timestamp-free format.

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