Update PyPi packaging

[Alan Zimmer (alzimmermsft)]

What does this PR do?

Updates PyProject TOML with the following changes:

• Add Python 3.14 and 3.15.
• Make Development Status injected based on the shipping version number.
• Dump TOML before creating the wheel to make debugging easier.

Updates __init__.py with the following changes:

• Simplifies the logic used to replace the version.
• Adds support for non-Azure MCP executables.

GitHub issue number?

[Link to the GitHub issue this PR addresses]

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Created a changelog entry if the change falls among the following: new feature, bug fix, UI/UX update, breaking change, or updated dependencies. Follow the changelog entry guide
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes running the script ./eng/scripts/Process-PackageReadMe.ps1. See Package README
  • For new or modified tool descriptions (excluding Fabric MCP tools), ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For renamed tools, follow the Tool Rename Checklist and tag the PR with the breaking-change label
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

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🟡 Changes recommended

Generated classifiers duplicate their prefix, and unlabeled zero-major versions cause packaging to throw.

2 open issues

• Avoid duplicating the Development Status classifier prefix · New
• Handle unlabeled 0.x.y versions as beta prereleases · New

What changed in this PR

Updates Python package metadata generation for MCP server distributions.

Changes:

• Adds Python 3.14 and 3.15 classifiers.
• Derives development status from the shipping version.
• Logs generated TOML before building wheels.

File	Description
eng/​scripts/​Pack-Pypi.ps1	Calculates development status and logs generated TOML.
eng/​pypi/​pyproject.toml.template	Adds Python classifiers and a development-status placeholder.

_{Review effort: Balanced}