Reduce LargeUriAndHeaders_Works test size on Android to fix timeout flakiness

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SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works was consistently timing out on Android because the test allocates 10M-character strings for the path, header name, and header value — too large for Android's HTTP stack within the allotted time.

Changes

• HttpClientHandlerTest.cs: Added Android-specific branch to the length calculation:

int length = IsWinHttpHandler ? 65_000
    : PlatformDetection.IsAndroid ? 100_000
    : 10_000_000;

This mirrors the existing WinHTTP size cap pattern and keeps non-Android platforms at the original 10M limit.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[FAIL] System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works</issue_title>
<issue_description>```
02-16 16:47:52.072 10194 24326 I DOTNET : [FAIL] System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works
02-16 16:47:52.072 10194 24326 I DOTNET : System.TimeoutException : The operation has timed out.
02-16 16:47:52.072 10194 24326 I DOTNET : at System.Net.Http.Functional.Tests.HttpClientHandlerTest.LargeUriAndHeaders_Works()

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1296274
Build error leg or test failing: System.Net.Http.Functional.Tests.WorkItemExecution
Pull request: https://github.com/dotnet/runtime/pull/124387
<!-- Error message template  -->
## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Projects/Build%20Analysis/KnownIssueJsonStepByStep.md).

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```json
{
  "ErrorMessage": "[FAIL] System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1296274
Error message validated: [[FAIL] System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 2/25/2026 7:27:26 AM UTC

Report

Build	Definition	Test	Pull Request
1317839	dotnet/runtime	System.Net.Http.Functional.Tests.WorkItemExecution	#124516
1321007	dotnet/runtime	System.Net.Http.Functional.Tests.WorkItemExecution	#124801
1321402	dotnet/runtime	System.Net.Http.Functional.Tests.WorkItemExecution
1320129	dotnet/runtime	System.Net.Http.Functional.Tests.WorkItemExecution	#124365
1320101	dotnet/runtime	System.Net.Http.Functional.Tests.WorkItemExecution	#125174
1320034	dotnet/runtime	System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works	#124720
1319961	dotnet/runtime	System.Net.Http.Functional.Tests.WorkItemExecution	#125146
1319852	dotnet/runtime	[System.Net.Http.Functional.Tests.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1319852&view=ms.vss-test-web.build-test-results-tab...

• Fixes [FAIL] System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandlerTest.LargeUriAndHeaders_Works #124487

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Pull request overview

Adjusts the LargeUriAndHeaders_Works functional test to avoid Android timeouts by reducing the size of the generated URI path and header strings on Android, while preserving the existing stress level on other platforms and the WinHTTP-specific cap.

Changes:

• Add an Android-specific length cap for the test data to reduce runtime/memory pressure on Android.
• Keep the existing WinHTTP cap (65,000) and the existing non-Android/non-WinHTTP size (10,000,000).