fix(media): change media sorting to addedTime descending

[dcshzj]

Problem

The ordering of the media files should be by the addedTime in descending order.

Solution

Breaking Changes

• Yes - this PR contains breaking changes
• No - this PR is backwards compatible with ALL of the following feature flags in this doc

Improvements:

• The media files are now sorted by the addedTime in descending order for users on GGS (i.e. email-login users).
  • Unfortunately, it is very expensive to get the addedTime for each file from the GitHub API, as there is no concept of creation timestamp (since it is entirely based on commits). We currently do get this information when individual files are requested, but it would get very expensive if we do this for all files at once.
  • Hence, we are retaining the existing behaviour of sorting by the file name for GitHub-login users, but we will let email-login users have the sorting by addedTime.

Tests

Unit tests, smoke tests on the frontend.

• Navigate to any site and visit the images workspace as an email-login user
• Verify that the images are sorted by their added time in descending order
• Navigate to any site and visit the images workspace as a GitHub-login user
• Verify that the images are still sorted by their file names in ascending order

Deploy Notes

None

[seaerchin]

double checking - we only sort by recency for email users? for github users still sort by name

[seaerchin]

do we not need this for github?

[seaerchin]

also, why not use stats.mtimeMs (last modified time - see here)

[seaerchin]

saw write up