Integrate migration alerts into deploy

[esoergel]

Implements dimagi/commcare-hq#27838, using @AliRizvi1 's work in #3951

[10.201.11.173] Executing task 'deploy_commcare'
List of PRs since last deploy:
1. Bump statici18n to version supporting Django 2.2 https://github.com/dimagi/commcare-hq/pull/28084 | product/invisible
2. [ICDS Dashboard] Pull the program summary data on the same level https://github.com/dimagi/commcare-hq/pull/28075 | product/custom
3. Fix sorting for FCT count column https://github.com/dimagi/commcare-hq/pull/28087 | product/all-users-all-environments
Are you sure you want to preindex and deploy to staging? [y/N] y

Since this significantly increases API requests to github, all users are now prompted to set up a github API key, though they can still abstain.

It also drops the use of git tags for diff URLs, instead, it always inspects the code root for the currently deployed commit. We did this already as a fallback, and I don't know that there was ever a good reason to not always do that.

[esoergel]

bump

[kaapstorm]

Sorry I missed this. This is really cool.