chore: add ENABLE_COURSE_DISCOVERY_DEFAULT_LANGUAGE_FILTER flag

[navinkarkera]

https://github.com/openedx/edx-platform/pull/33647

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[mphilbrick211]

Hi @navinkarkera - is this ready for review?

[mphilbrick211]

@openedx/axim-engineering I think this is all set.

[feanil]

It looks like this is blocked on the code PR https://github.com/openedx/edx-platform/pull/33647 landing. We shouldn't merge this until after that has merged.

[farhaanbukhsh]

@feanil The PRs are merged :)

[navinkarkera]

Closing, deemed unnecessary. See this comment