feat: get_last_publish log for PublishableEntity [FC-0059]

[pomegranited]

Description

Adds support for fetching the most recent PublishLog for a given Component, by querying the relevant PublishLogRecords.

Testing instructions

See openedx/openedx-platform#35195 for full testing instructions.

[openedx-webhooks]

Thanks for the pull request, @pomegranited!

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[pomegranited]

Hi @ormsbee :) When you get a chance, could you have a look at the approach I took here and let me know if there's anything I should change?

[rpenido]

LGTM 👍
Thank you for your work @pomegranited !

• I tested this using the instructions from openedx/openedx-platform#35195
• I read through the code
• I checked for accessibility issues
• Includes documentation

[yusuf-musleh]

👍 It's working well @pomegranited, great work!

• I tested this: Followed testing instructions in openedx/openedx-platform#35195
• I read through the code
• I checked for accessibility issues
• Includes documentation

[openedx-webhooks]

@pomegranited 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.