feat: Accept Android assembly store v4 versions

[jamescrosswell]

First step of porting the upstream dotnet/android AssemblyStore reader changes (up to f1aecf9) so we can read .NET 11 (CoreCLR) v4 assembly stores.

Part of #5454

Summary

• StoreReader now accepts 0x_0000004 store versions for all four ABIs.
• v4 adds an 8-byte content_id to the header, so it's read when the format number is >= 4 and Header.NativeSize is derived from the version rather than being a constant. Accepting the version alone isn't enough - the index would be read 8 bytes early and Prepare() would fail.
• New StoreReaderTests build minimal in-memory v3/v4 stores (32- and 64-bit) and check they parse, and that v2/v5 are rejected.

Notes

• The APK-based AndroidAssemblyReaderTests stay skipped on net11.0: real .NET 11 APKs also need _assembly_store ELF dynamic-symbol payload discovery, which is the next step in Port upstream AssemblyStore reader changes: v4/CoreCLR format, _assembly_store symbol, index-entry sizing (next major) #5454. Those skips come off with that change.
• v2 stores are intentionally not supported: support for them was dropped along with net9.0-android in feat: add support for .NET 11 preview 7 #5529, and upstream's V2 index-entry layouts won't be ported.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (version7@21f45f0). Learn more about missing BASE report.

Additional details and impacted files

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##             version7    #5574   +/-   ##
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  Hits                ?    14123           
  Misses              ?     3893           
  Partials            ?      880           

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[sentry]

Bug: The test helper CreateStore unconditionally writes an ignore byte, but StoreReader.Prepare() only reads it on .NET 10.0_OR_GREATER, causing a stream misalignment on older frameworks.
_{Severity: LOW}

Suggested Fix

The test helper CreateStore should be updated to conditionally write the ignore byte, matching the logic in the production StoreReader.Prepare() method. This can be achieved by using the same #if NET10_0_OR_GREATER preprocessor directive in the test code to ensure the test data format is consistent with what the reader expects on all target frameworks.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: test/Sentry.Android.AssemblyReader.Tests/StoreReaderTests.cs#L60

Potential issue: The test helper method `CreateStore` unconditionally writes an `ignore`
byte when creating a test store. However, the `StoreReader.Prepare()` method, which
reads this store, only consumes this byte when compiled for `.NET 10.0_OR_GREATER` due
to a preprocessor directive. On older target frameworks, this byte is not read, causing
the reader's stream position to be misaligned by one byte. This misalignment will lead
to incorrect data being read for subsequent assembly descriptors, causing tests to fail
or produce garbage data on pre-.NET 10.0 targets. This is a test-only issue but prevents
correct validation across all supported frameworks.

Also affects:

• src/Sentry.Android.AssemblyReader/V2/StoreReader.cs:163~167

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[jamescrosswell]

We only target .NET 10 and later for Android.