MOBILE-182: Pin DateFormatter locale to fix dateTimeUtc on InAppShowFailure

[Vailence]

Ticket: https://tracker.yandex.ru/MOBILE-182

Summary

InappShowFailureManager сериализует dateTimeUtc через Date.toString(withFormat: .utc). Без Locale(identifier: "en_US_POSIX") форматтер на устройствах с 12-часовой региональной настройкой подменяет HH:mm:ss на h:mm:ss a и формирует невалидную для бэкенда строку. Запинили локаль на всех форматтерах в MindboxLogger и схлопнули дублирующий ISO-8601 в Mindbox/Extensions/Date+Extensions.swift в один источник правды.

Type of Change

• Bug fix

Changes

• Запинен Locale(identifier: "en_US_POSIX") на всех DateFormatter в MindboxLogger/Shared/Extensions/Date+Extension.swift и String+Extensions.swift
• Исправлен hh:mm:ss.SSSS → HH:mm:ss.SSSS в Date.dateFormatter (был 12-часовым)
• Добавлен DateFormat.utcWithMillis для парсинга миллисекундных payload'ов
• Удалён дублирующий Mindbox/Extensions/Date+Extensions.swift; DateTime.decodeWithFormat и MindboxWebViewFacade переведены на унифицированный String.toDate(withFormat:) / Date.toString(withFormat:)
• InappShowFailureManagerTests локальный makeUTCFormatter() заменён на String.toDate(withFormat: .utc)
• Новый Swift Testing-сьют DateFormatTests фиксирует литералы .utc / .api / .utcWithMillis, парс round-trip и явный регресс-гард на 12h-leak
• Shape-assert в testAddFailure_setsDateTimeUtcInsideMethod: длина 20, суффикс Z, нет AM/PM/пробелов, regex ^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z$ — контракт исходящего поля привязан к литералу, а не только к round-trip через тот же парсер

Testing

• Unit tests added/updated
• Manual testing performed

[Copilot]

Pull request overview

Fixes an iOS locale-dependent DateFormatter issue that could generate invalid dateTimeUtc strings (12-hour format leaking into a fixed UTC contract), and consolidates ISO-8601 date parsing/formatting into MindboxLogger as the single source of truth.

Changes:

• Pinned Locale(identifier: "en_US_POSIX") for all relevant DateFormatter usage in MindboxLogger and corrected a 12-hour (hh) format to 24-hour (HH) where appropriate.
• Unified ISO-8601 parsing by routing DateTime decoding through String.toDate(withFormat:) with a new .utcWithMillis fallback, and removed the duplicate Mindbox/Extensions/Date+Extensions.swift.
• Strengthened regression coverage with a new Swift Testing suite (DateFormatTests) and stricter shape assertions in InappShowFailureManagerTests.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
MindboxTests/MindboxLogger/DateFormatTests.swift	Adds Swift Testing coverage for UTC/API literals, millis parsing, and a regression guard against 12h-format leakage.
MindboxTests/InApp/Tests/InappShowFailureManagerTests.swift	Updates parsing to shared formatter utilities and asserts the outbound dateTimeUtc contract shape.
MindboxTests/Extensions/Tag+Extensions.swift	Adds a dateFormatting tag used by the new test suite.
MindboxLogger/Shared/Extensions/String+Extensions.swift	Adds .utcWithMillis and pins POSIX locale for parsing via toDate(withFormat:).
MindboxLogger/Shared/Extensions/Date+Extension.swift	Pins POSIX locale for formatting and fixes a 12h (hh) formatter to 24h (HH).
Mindbox/Model/Common/MBDate.swift	Switches DateTime decoding to unified logger parsing with millis fallback.
Mindbox/InAppMessages/Presentation/Views/WebView/Debug/MindboxWebViewFacade.swift	Switches first-init timestamp serialization to toString(withFormat: .utc).
Mindbox/Extensions/Date+Extensions.swift	Removes duplicated ISO-8601 parsing/formatting implementation.
Mindbox.xcodeproj/project.pbxproj	Updates Xcode project references (adds new tests, removes deleted date extension file).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[justSmK]

У тебя коммиты с номером задачи и названием ветки разъехались. Надо бы поправить