Remove unused analytics

[yanokwa]

Closes #2916

What has been done to verify that this works as intended?

Searched codebase for all setCategory and removed the calls to the events that generate the most hits (ExternalData, Itemset) or are top events and are not actionable (AuditLogging).

I did not verify on a device or Google Analytics that these events are not being sent.

Why is this the best possible solution? Were any other approaches considered?

Narrowest change possible

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

There should be no user-facing changes

Do we need any specific form for testing your changes? If so, please attach one.

No

Does this change require updates to documentation? If so, please file an issue here and include the link below.

No

Before submitting this PR, please make sure you have:

• run ./gradlew checkAll and confirmed all checks still pass OR confirm CircleCI build passes and run ./gradlew connectedDebugAndroidTest locally.
• verified that any code or assets from external sources are properly credited in comments and/or in the about file.
• verified that any new UI elements use theme colors. UI Components Style guidelines

[lognaturel]

I would keep this since it's an evolving feature. It might also be good to log when location is turned on.

[lognaturel]

Can you say more about audit logging not being actionable? It feels to me like it's important to know whether it's something to keep investing in. I suppose if that's already decided, the logging doesn't matter.

[lognaturel]

I checked in with @yanokwa in person and he said "people who use the audit log say it's a game changer so we're going to continue investing in it regardless." 👍

[grzesiek2010]

Could we remove logs about using the splash screen as well? Here I noticed they cause crash sometimes. I think those we have collected during last two months are enough to make a decision whether we can remove the screen or not.

[mmarciniak90]

Tested with success.
I did not notice regression.

Verified on Android: 4.2, 4.4, 5.1, 6.0, 7.0, 8.1

I focused the most on forms:

• All widgets form, especially widget with image-map appearance
• form with audit
• form with data loaded from external CSV file
• splash screen

@opendatakit-bot unlabel "needs testing"
@opendatakit-bot label "behavior verified"