Remove implicit save changes in mocha ef core middleware

[PascalSenn]

No description provided.

[Copilot]

Pull request overview

This PR removes the implicit DbContext.SaveChangesAsync call from Mocha’s EF Core transaction middleware and updates the documentation to reflect that command handlers must persist changes explicitly.

Changes:

• Removed automatic SaveChangesAsync invocation from EntityFrameworkTransactionMiddleware before committing.
• Updated the middleware XML docs to clarify that handlers must call SaveChangesAsync.
• Updated the mediator pipeline documentation and EF transaction section to describe the new responsibility split (handlers save; middleware manages transaction lifecycle).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
website/src/docs/mocha/v1/mediator/pipeline-and-middleware.md	Updates the transaction middleware examples/description to remove implicit saving and clarify handler responsibilities.
src/Mocha/src/Mocha.EntityFrameworkCore/EntityFrameworkTransactionMiddleware.cs	Removes implicit SaveChangesAsync calls and updates XML docs accordingly.

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