Cleanup: git config, implicit usings, test common fixes, and build props

[paulmedynski]

Summary

Housekeeping cleanup that removes unnecessary items and fixes minor issues:

• Git config: Simplified .gitattributes and .gitignore by removing redundant entries
• Implicit usings: Enabled implicit usings TestCommon project and removed unnecessary using directives from test common files
• Test common: Removed unused fixture imports and cleaned up test helper code
• Build props: Updated tools/props/AssemblyInfo.props, AssemblyRef.props, and tools/targets/RepositoryInfo.targets
• Ruleset: Minor update to ManualTesting.Tests.ruleset

Changes

• 16 files changed, 43 insertions, 344 deletions (net reduction of ~300 lines)

Checklist

• No functional changes
• No public API changes
• No breaking changes

[Copilot]

Pull request overview

Housekeeping PR focused on reducing repository noise (git config + generated files), cleaning up MSBuild metadata, and streamlining test common sources to rely more on project-level compiler settings.

Changes:

• Simplifies .gitattributes and trims .gitignore (including adding a pattern for C# language server cache files).
• Enables implicit usings in Microsoft.Data.SqlClient.TestCommon and removes now-redundant using directives / nullable pragmas from common test code.
• Cleans up build/analysis metadata files (MSBuild props/targets and the ManualTests ruleset).

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tools/targets/RepositoryInfo.targets	Reduces build log verbosity for the translated ScmRepositoryUrl message.
tools/props/AssemblyRef.props	Simplifies MSBuild project header metadata.
tools/props/AssemblyInfo.props	Simplifies MSBuild project header metadata.
src/Microsoft.Data.SqlClient/tests/ManualTests/Microsoft.Data.SqlClient.ManualTesting.Tests.ruleset	Removes Ruleset ToolsVersion metadata and normalizes formatting.
src/Microsoft.Data.SqlClient/tests/Common/Microsoft.Data.SqlClient.TestCommon.csproj	Enables <ImplicitUsings> for the TestCommon helper library.
src/Microsoft.Data.SqlClient/tests/Common/LocalAppContextSwitchesHelper.cs	Removes redundant using directives now covered by implicit usings.
src/Microsoft.Data.SqlClient/tests/Common/Fixtures/DatabaseObjects/DatabaseObject.cs	Removes redundant using directives and normalizes doc comment whitespace.
src/Microsoft.Data.SqlClient/tests/Common/Fixtures/CspCertificateFixture.cs	Removes redundant using directives now covered by implicit usings.
src/Microsoft.Data.SqlClient/tests/Common/Fixtures/ColumnMasterKeyCertificateFixture.cs	Removes redundant using directives now covered by implicit usings.
src/Microsoft.Data.SqlClient/tests/Common/Fixtures/ColumnEncryptionCertificateFixture.cs	Removes redundant using directives now covered by implicit usings.
src/Microsoft.Data.SqlClient/tests/Common/Fixtures/CertificateFixtureBase.cs	Removes redundant using directives and normalizes whitespace.
src/Microsoft.Data.SqlClient/tests/Common/Fixtures/AzureKeyVaultKeyFixtureBase.cs	Fixes malformed header comment and removes redundant using directives.
src/Microsoft.Data.SqlClient/tests/Common/DisposableArray.cs	Removes redundant using directives and file-level nullable pragma (project-level nullable applies).
src/Directory.Build.props	Simplifies MSBuild project header metadata and clarifies versioning comments.
.gitignore	Trims ignore list and adds ignore for *.lscache.
.gitattributes	Simplifies to line-ending normalization + workflow lock file attributes.

[paulmedynski]

ToolsVersion is an antiquated attribute that the modern .NET SDK doesn't need specified.

[paulmedynski]

This file (and a few others below) don't have a Build target, so this was incorrect, and unnecessary anyway.

[paulmedynski]

This was noise on the console.

[paulmedynski]

Reduced this to ignore files that we may actually create. I would rather see some unexpected files and then investigate why they have been created, than ignore them and never notice. If other folks use tooling that creates files we're no longer ignoring, please add them back with suitable comments.

[paulmedynski]

Removed boilerplate that we weren't customizing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.78%. Comparing base (b700269) to head (3018a56).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4301      +/-   ##
==========================================
- Coverage   66.04%   64.78%   -1.27%     
==========================================
  Files         275      279       +4     
  Lines       42976    66211   +23235     
==========================================
+ Hits        28383    42892   +14509     
- Misses      14593    23319    +8726     

Flag	Coverage Δ
CI-SqlClient	?
PR-SqlClient-Project	64.78% <ø> (?)

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