Use raw values, not display text, for Entity property values

[grzesiek2010]

Closes #6510

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

There is no other solution to discuss. If we want to use plain, unformatted strings, we need to uncast the value and read the string.
There is one issue that needs to be addressed in javarosa I belive: https://github.com/getodk/collect/pull/6514/files#r1844165858

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?

Regardless of the data type used to store entities, the values saved to them should be plain, unformatted text, identical to what is stored in XML submissions. I think testing dates here is sufficient; we don't need to test other data types. Even if this issue affects other data types, the PR should address all cases.

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

I used:
entities_with_dates_registration.xlsx

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:

• added or modified tests for any new or changed behavior
• run ./gradlew connectedAndroidTest (or ./gradlew testLab) and confirmed all checks still pass
• added a comment above any new strings describing it for translators
• added any new strings with date formatting to DateFormatsTest
• 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

[grzesiek2010]

There is a problem with saving dates as labels. I fixed it here: https://github.com/getodk/collect/pull/6514/files#diff-dcf4e4fc03ff048616e3d821f4dc1ff53ea090480626d6516d0ac054b35c1446R35 but the problem is that such an element is identified as DateTime data type not just Date. It seems to be a bug in javarosa so I'm going to file an issue there.

[grzesiek2010]

The issue is here: getodk/javarosa#807

[seadowg]

The solution looks good as far as I can tell, although I wasn't familiar with the uncast method.

I think we could test this at the unit level for EntityFormFinalizationProcessor and EntityFormParser instead of needing a connected test though. @grzesiek2010 could you make that change in a follow-up? That way we're not blocking this for test changes.

[grzesiek2010]

@grzesiek2010 could you make that change in a follow-up? That way we're not blocking this for test changes.

Ok I will do that.

[srujner]

Verified on device with Android 14

[dbemke]

Verified on device with Android 10