feat: add ADO.NET authentication parameter synonyms

[Copilot]

Implementation Plan for ADO.NET Authentication Synonyms

• Add "authentication" as a synonym for "fedauth" in msdsn/conn_str.go adoSynonyms map
• Update azuread/configuration.go to support ADO.NET authentication value names:
  • "Sql Password" (for SQL authentication, not Azure AD - map to empty/no-op)
  • "Active Directory Password" (synonym for ActiveDirectoryPassword)
  • "Active Directory Integrated" (synonym for ActiveDirectoryIntegrated)
  • "Active Directory Interactive" (synonym for ActiveDirectoryInteractive)
  • "Active Directory Service Principal" (synonym for ActiveDirectoryServicePrincipal)
  • "Active Directory Device Code Flow" (synonym for ActiveDirectoryDeviceCode)
  • "Active Directory Managed Identity" (synonym for ActiveDirectoryManagedIdentity)
  • "Active Directory MSI" (synonym for ActiveDirectoryMSI)
  • "Active Directory Default" (synonym for ActiveDirectoryDefault)
  • "Active Directory Workload Identity" (synonym for ActiveDirectoryWorkloadIdentity)
• Add tests for new synonym in msdsn package
• Add tests for new authentication value names in azuread package
• Run unit tests to verify changes
• Address all code review feedback
• Clean up code formatting
• Improve code comments
• Merge with main branch
• Fix merge conflicts
• All tests passing after merge

Summary

Successfully implemented ADO.NET authentication synonyms and value names. After merging with main, resolved a merge conflict where a new test was inserted in the middle of the TestAuthenticationSynonym test. All tests now pass successfully.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add more ADO.Net synonyms to connection string parameters</issue_title>
<issue_description>

go-mssqldb/msdsn/conn_str.go

Line 649 in 8c35947

var adoSynonyms = map[string]string{

At minimum, add "Authentication" as a synonym for "fedauth".

Also, update the azuread package to support the same set of Authentication name values as ADO.Net in addition to the names it already supports as values for the fedauth parameter.

The name values ADO.NEt supports are:

 const string SqlPasswordString = "Sql Password";
        const string ActiveDirectoryPasswordString = "Active Directory Password";
        const string ActiveDirectoryIntegratedString = "Active Directory Integrated";
        const string ActiveDirectoryInteractiveString = "Active Directory Interactive";
        const string ActiveDirectoryServicePrincipalString = "Active Directory Service Principal";
        const string ActiveDirectoryDeviceCodeFlowString = "Active Directory Device Code Flow";
        internal const string ActiveDirectoryManagedIdentityString = "Active Directory Managed Identity";
        internal const string ActiveDirectoryMSIString = "Active Directory MSI";
        internal const string ActiveDirectoryDefaultString = "Active Directory Default";
        internal const string ActiveDirectoryWorkloadIdentityString = "Active Directory Workload Identity";
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Add more ADO.Net synonyms to connection string parameters #288

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.38%. Comparing base (fdee61d) to head (af8c1bf).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
+ Coverage   79.70%   85.38%   +5.67%     
==========================================
  Files          34       34              
  Lines        6598     7314     +716     
==========================================
+ Hits         5259     6245     +986     
+ Misses       1067      816     -251     
+ Partials      272      253      -19     

see 6 files with indirect coverage changes

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[dlevy-msft-sql]

@copilot Re-check this PR using the latest head commit (after merging main) and the newest Actions run. The workflow fix is already in main

[Copilot]

@copilot Re-check this PR using the latest head commit (after merging main) and the newest Actions run. The workflow fix is already in main

Re-checked the PR after merging with main. Fixed a merge conflict in conn_str_test.go where TestEncodeParametersGetTimezone was inserted in the middle of TestAuthenticationSynonym. All tests now pass successfully (commit af8c1bf).

[dlevy-msft-sql]

Closing in favor of #368, which implements the same feature with a cleaner approach (package-level map, no per-call allocation, no params mutation). Both fix #288.