refactor: merge PublicUserMapper with UserMapper

[typfel]

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PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
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What's new in this PR?

Issues

I don't see any clear distinction between PublicUserMapper and UserMapper so why not merge them and have all related methods in one place.

I also tried to remove unnecessary or unused mapper methods.

• fromUserProfileDtoToOtherUser is now a composite method of fromUserProfileDtoToUserEntity and fromUserEntityToOtherUser
• fromSelfUserToUserDetailsEntity, fromSelfUserDtoToUserDetailsEntity, fromUserProfileDtoToUserDetailsEntity, fromFailedUserToDetailsEntity were all removed since they were unused (we never insert UserDetailsEntity because the additional properties are computed.)
• replaced fromUpdateRequestToDaoModel with fromUpdateRequestToPartialUserEntity, this avoids mapping from SelfUser to UserEntity.

Future work

fromSelfUserToUserEntity and fromOtherToUserEntity is now only when importing old android scala users. If we could map directly an android scala user to a UserEntity we would complete get rid of any mapping from the model layer to to DAO.

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PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

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PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

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References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Unit Test Results

   455 files  ±0     455 suites  ±0   2m 28s ⏱️ -1s
2 532 tests ±0  2 430 ✔️ ±0  102 💤 ±0  0 ❌ ±0 

Results for commit a745eb8. ± Comparison against base commit 6ce6fad.

♻️ This comment has been updated with latest results.

[mchenani]

LGTM

[datadog-wireapp]

Datadog Report

All test runs 58d9d4f 🔗

✅ 2 Total Test Services: 0 Failed, 0 with New Flaky, 2 Passed

Test Services

Service Name	Failed	Known Flaky	New Flaky	Passed	Skipped	Wall Time	Branch View
kalium-ios	0	0	0	2109	66	8m 53.11s	Link
kalium-jvm	0	0	0	2430	102	11m 44s	Link