[StoreKit] Fix StoreKit iTunes identifier width. Fixes #25219.

[rolfbjarne]

Keep StoreProductParameters and related StoreKit numeric identifiers on long values
so App Store IDs above Int32.MaxValue compile and round-trip correctly.

Fixes #25219.

[Copilot]

Pull request overview

Updates StoreProductParameters to support App Store/iTunes identifiers larger than Int32.MaxValue, and adds regression tests to ensure 64-bit values round-trip correctly through the underlying dictionary.

Changes:

• Added a 64-bit iTunes identifier API surface to StoreProductParameters (constructor + property backed by GetLongValue/SetNumberValue).
• Added new StoreKit unit tests validating 64-bit identifier round-tripping and legacy behavior (where applicable).
• Extended DictionaryContainer tests to cover storing/removing long? numeric values.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/monotouch-test/StoreKit/StoreProductParametersTest.cs	Adds tests for 64-bit identifier round-trip + legacy behavior under !XAMCORE_5_0.
tests/monotouch-test/Foundation/DictionaryContainerTest.cs	Adds coverage for setting/removing long? number values in DictionaryContainer.
src/StoreKit/StoreProductParameters.cs	Introduces 64-bit identifier support and wires it to GetLongValue/SetNumberValue.

[vs-mobiletools-engineering-service2]

✅ [CI Build #209830f] Build passed (Build packages) ✅

Pipeline on Agent
Hash: 209830fed1e2bc9642bb5753e47b254a3aaa2dbd [PR build]

[vs-mobiletools-engineering-service2]

✅ [PR Build #209830f] Build passed (Detect API changes) ✅

Pipeline on Agent
Hash: 209830fed1e2bc9642bb5753e47b254a3aaa2dbd [PR build]

[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

NET (empty diffs)

• iOS: vsdrops gist ( No breaking changes )
• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
• macOS: vsdrops gist ( No breaking changes )

✅ API diff vs stable

NET (empty diffs)

• iOS: vsdrops gist ( No breaking changes )
• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
• macOS: vsdrops gist ( No breaking changes )

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

Pipeline on Agent
Hash: 209830fed1e2bc9642bb5753e47b254a3aaa2dbd [PR build]

[vs-mobiletools-engineering-service2]

✅ [CI Build #209830f] Build passed (Build macOS tests) ✅

Pipeline on Agent
Hash: 209830fed1e2bc9642bb5753e47b254a3aaa2dbd [PR build]

[vs-mobiletools-engineering-service2]

🔥 [CI Build #209830f] Test results 🔥

Test results

❌ Tests failed on VSTS: test results

1 tests crashed, 0 tests failed, 151 tests passed.

Failures

❌ Tests on macOS Monterey (12) tests

🔥 Failed catastrophically on VSTS: test results - mac_monterey (no summary found).

Html Report (VSDrops) Download

Successes

✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker: All 44 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 11 tests passed. Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 15 tests passed. Html Report (VSDrops) Download
✅ monotouch (macOS): All 12 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 11 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ sharpie: All 1 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

macOS tests

✅ Tests on macOS Ventura (13): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sonoma (14): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sequoia (15): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Tahoe (26): All 5 tests passed. [attempt 2] Html Report (VSDrops) Download

Linux Build Verification

✅ Linux build succeeded

Pipeline on Agent
Hash: 209830fed1e2bc9642bb5753e47b254a3aaa2dbd [PR build]