Fix #4495, part of #3088, #4467, #4505, #4266, #4446: Miscellaneous alpha MR5 fixes

[BenHenning]

Explanation

Fixes #4495
Fixes part of #3088
Fixes #4467
Fixes #4505
Fixes #4266
Fixes #4446

This PR fixes a number of key blockers for the upcoming Alpha MR5 release of the app. In particular:

• It fixes To review: PRs requiring Rajat approval #4266 by reformatting one XML file that Rajat left a comment for during his post-merge reviews of Alpha MR4 PRs.
• It mitigates Wrong voiceover language is being played when the student selects English. #4495 by introducing a banner for when correct audio can't be played (I did run into an actual bug where the wrong audio played once, but I couldn't repro it--most of the time the app will stop autoplaying if it can't find the correct language). This also fixes part of Voiceovers switch from English to Hindi #3088 since the mitigation will help make that situation better.
• It addresses Add analytics for answers #4467 by logging stringified versions of all supported answer types upon answer submission (rather than just whether the answer is correct).
• It addresses Add placeholders for text based interactions #4446 by (1) introducing a new default hint text for text input, and (2) by ensuring hint text is fully readable by wrapping it when it extends to more than one line. However, another issue was discovered which would be really nice to fix (but is not feasible given the amount of time available for this PR). Text-based interaction EditText hints sometimes disappear when the keyboard is closed #4509 is tracking this future work.
• It addresses Profile names with numbers are needed in Kenya user study #4505 by disabling profile name verification when the learner study is enabled (as a stop-gap).

Note that there are no new tests being added in this PR since the fixes are mostly trivial and have been manually verified during development. #4510 is tracking adding automated tests for long-term app health.

Furthermore, AudioViewModel was allow-listed to reference Locale directly so that it can it include a localized language name in the fail-to-play audio notice. #3791 will fix this in the long-term.

This PR also includes version code & minor version bumps to prepare for the upcoming release. It also fixes the Kenya-specific alpha build flavor (which was unfortunately checked in as broken in #4507), and adds it to CI since the assumption in #4507 that it doesn't need to be covered is incorrect. The Gradle workaround for the new flavor was removed since it was a legitimate failure that wasn't being picked up by Bazel builds in CI.

Essential Checklist

• The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

For UI-specific PRs only

Creating profile names with normally forbidden characters (in this case, numbers):

create_profile_with_number.mp4

Demonstrating when English audio is sometimes unavailable & the new notice to make this clearer:

english_audio_unavailable.mp4

Audio not being available can occur in all languages, not just English:

Text input hints can now be multi-line to ensure that they're not cut off:

[BenHenning]

Similar to other PRs, force-merging this with the intent of post-merge review (to help expedite the alpha release dependent on these changes).