feat: put sending xblock events over bus behind feature flag

[navinkarkera]

As per discussion in #31350 (comment), this MR adds a feature flag to enable/disable sending xblock related openedx-events to external bus.

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[rgraber]

I would call this a feat: rather than refactor: but that's a minor point.

[rgraber]

LGTM

[mariajgrimaldi]

@dianakhuang @rgraber @rgraber: this looks great! merge when convenient :)

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[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.

[pdpinch]

Hi. I help write the release notes for open edX, and I have a couple of questions:

• Will the event bus be supported in the next release, Palm?
• As an open edX operator, where would I find out more information about how to turn on the event bus?
• Is this the only required flag?

[navinkarkera]

@pdpinch

Will the event bus be supported in the next release, Palm?

I think it is already supported, so it should be the same in next release. cc @mariajgrimaldi

As an open edX operator, where would I find out more information about how to turn on the event bus?

Below links should be helpful:

• https://github.com/openedx/event-bus-kafka
• https://github.com/openedx/event-bus-kafka/blob/main/docs/how_tos/manual_testing.rst

Is this the only required flag?

Yes.