Remove newrelic from edx-platform dependencies

[timmc-edx]

newrelic should not be listed as a dependency of edx-platform -- we rely on the abstraction layer in edx-django-utils (and that library also declares a dependency on it).

A/C:

• Confirm that there are no remaining newrelic references in Python code in edx-platform or the things that are installed into it, even in try-import blocks.
• Remove dependency from bundled.in
  • PR: build: Remove newrelic from dependencies; note system deps in README openedx/edx-platform#35683

(Later we can look into DEPRing the newrelic dependency in edx-django-utils as well -- we should probably have extra-deps of edx-django-utils that pull in Datadog, New Relic, or OTel as needed, and which deployers can add to their additional package list.)

[robrap]

Maybe this whole ticket should just be replaced by a DEPR ticket?

[jristau1984]

Tim confirmed there are several other repos with this reference in python code, but edx-platform is not in that list. Remove NR from the edx-platform requirements list.

DEPR from django-utils can be done at a future time.

[timmc-edx]

Completed, and ticket updated to scope the work down.