Alpha MR4 release tracking issue

[BenHenning]

We're preparing to cut the alpha MR4 release. The following work items are scheduled to be included:

• Submit-time errors permanently break the answer submission flow #3861 (at least a mitigation, but potentially the whole fix if math expressions is included)
• Unable to move past a card in Chapter 6 (Fractions) #4026
• Image size too small or illegible #4027 (some images may be slightly blurry, but still legible)
• Unable to access Admin profile and Admin Controls #4040
• Add basic learner analytics support #4064

The following items are tentatively planned to be included, but may be cut last minute:

• Add support for numeric & algebraic expressions/equations interactions support #4044
• Continue button changes to a conversation message when going backwards in a chapter #4076
• Update Hints icon  #4197
• StateFragmentTest is flaky due to ExplorationProgressController deadlock #4238

Items definitely not getting into MR4 (that will need to be moved to MR5)

• Text voiceovers in English for Portuguese language #3821
• Add all pt-br translations #4224
• TODO: follow-up work items for math expressions

Note that all items in Alpha MR4's milestone are targeting this release, aside from the ones specifically mentioned above (e.g. bugs may be found during testing and will be added to that milestone if they are deemed to be blockers of the release).

[BenHenning]

/cc @srushtirk @isalooo @anandwana001 @seanlip

[BenHenning]

Alpha MR4 is now live on the Play Store. See the release notes here: https://github.com/oppia/oppia-android/releases/tag/v0.7.