Update sdk version and switch to System.Composition.

[mdaigle]

System.Composition is still actively maintained: https://www.nuget.org/packages/System.Composition
Validated that this addresses component governance warnings: https://sqlclientdrivers.visualstudio.com/ADO.Net/_git/dotnet-sqlclient/pullrequest/7114

[Copilot]

Pull request overview

Updates the tooling dependencies used by the GenAPI-related projects by moving from the legacy Microsoft.Composition package to the actively maintained System.Composition, and bumps the pinned .NET 10 SDK patch version used by builds/CI.

Changes:

• Replace Microsoft.Composition with System.Composition in the GenAPI CCI extensions project.
• Update centralized tool package versions to include System.Composition (and drop Microsoft.Composition).
• Bump global.json SDK from 10.0.103 to 10.0.104.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tools/GenAPI/Microsoft.Cci.Extensions/Microsoft.Cci.Extensions.csproj	Switches MEF dependency to System.Composition for the CCI extensions tool project.
tools/Directory.Packages.props	Central package versioning updated to use System.Composition instead of Microsoft.Composition.
global.json	Updates the pinned .NET SDK patch version used by dotnet CLI and CI.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.15%. Comparing base (00b77cd) to head (bafbe81).
⚠️ Report is 3 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (00b77cd) and HEAD (bafbe81). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (00b77cd)	HEAD (bafbe81)
CI-SqlClient	2	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4052      +/-   ##
==========================================
- Coverage   75.42%   68.15%   -7.27%     
==========================================
  Files         280      275       -5     
  Lines       43834    66924   +23090     
==========================================
+ Hits        33060    45613   +12553     
- Misses      10774    21311   +10537     

Flag	Coverage Δ
CI-SqlClient	?
PR-SqlClient-Project	68.15% <ø> (?)

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