feat: update data feed test

[JulissaDantes]

This PR introduces 3 main changes:

• Un-skips the resumability test, and uses the resume Token
• Updates the Event accumulator to be able to include a resume token
• Updates the codec test to include the resumeToken field

Please wait until its not longer a draft to review, just in case some side-efforts will result in updates to this PR.

[stbrody]

lgtm.

Some nitpick feedback, more for future reference than anything, but would be nice to have a more descriptive PR name and commit message, something that includes how/why the test is being updated. So something like "feat: Test data feed resumability"