Add TypeSpec for new upgrade API

[coolzyx]

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Important checks have failed. As of today they are not blocking this PR, but in near future they may.
Addressing the following failures is highly recommended:

• ⚠️ The check named Swagger LintDiff has failed. Refer to the check in the PR's 'Checks' tab for details on how to fix it and consult the aka.ms/ci-fix guide

Comment generated by summarize-checks workflow run.

[psah434]

does this not generate a change in the swagger json?

[judyzhu10]

please add your api example file to specification/mysql/resource-manager/Microsoft.DBforMySQL/Flexible servers/examples/2026-03-01-preview

[coolzyx]

please add your api example file to specification/mysql/resource-manager/Microsoft.DBforMySQL/Flexible servers/examples/2026-03-01-preview

Done

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