Remove outdated 'FastMCP 3.0 is coming!' CLI banner

[jlowin]

FastMCP 3 is out, so the promotional banner telling users it's coming is now just confusing. This removes it from the server startup banner.

Closes #2972

[coderabbitai]

Walkthrough

The change removes the outdated "FastMCP 3.0 is coming!" notice panel from the CLI banner displayed by the server. The removal includes the definition of three variables (v3_line1, v3_line2, v3_notice) and the line appending the v3_notice panel to the output sequence. The total change removes 15 lines of code from src/fastmcp/utilities/cli.py. The main banner panel and its construction logic remain unaffected.

Possibly related PRs

• Update CLI banner with FastMCP 3.0 notice #2765: Modifies the same CLI banner code in src/fastmcp/utilities/cli.py with conflicting changes to the v3 notice panel—directly related to this removal.
• Update CLI banner with FastMCP 3.0 notice #2766: Changes banner behavior and touches the v3 notice panel in src/fastmcp/utilities/cli.py—directly related to this removal.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the motivation and closes the linked issue, but does not follow the required repository template with checklists for contributors and reviewers.	Add the Contributors Checklist and Review Checklist sections from the template to verify testing, documentation updates, and review readiness.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: removing the outdated 'FastMCP 3.0 is coming!' CLI banner, which directly corresponds to the primary objective of the PR.
Linked Issues check	✅ Passed	The changes directly address issue #2972 by removing the v3 notice panel definition and its line from the output, exactly as requested.
Out of Scope Changes check	✅ Passed	The only change is removal of 15 lines related to the v3 notice banner from src/fastmcp/utilities/cli.py, which is strictly within the scope of issue #2972.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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