Remove unused newrelic

[rhysyngsun]

What are the relevant tickets?

N/A

Description (What does it do?)

Removes the newrelic dependency as we haven't used it in a while and it's now failing to install.

How can this be tested?

Tests should pass

[github-actions]

OpenAPI Changes

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Unexpected changes? Ensure your branch is up-to-date with main (consider rebasing).

[sentry]

Bug: The newrelic package is removed, but the Procfile still uses the newrelic-admin command, which will cause application startup to fail.
_{Severity: CRITICAL}

Suggested Fix

Remove the newrelic-admin run-program command from the web, worker, and extra_worker process definitions in the Procfile since the newrelic package that provides it is being removed.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: pyproject.toml#L56

Potential issue: The pull request removes the `newrelic` package dependency from
`pyproject.toml`. However, the `Procfile` was not updated and still contains startup
commands for the `web`, `worker`, and `extra_worker` processes that rely on
`newrelic-admin`, a command-line tool from that package. After this change is deployed,
the `newrelic-admin` command will no longer exist. This will cause all application
processes to fail to start with a 'command not found' error, preventing the application
from running entirely.

_{Did we get this right? 👍 / 👎 to inform future reviews.}