Studio: open the MCP dialog to the server list

[oobabooga]

Currently the "Add custom MCP" button opens the dialog to add a new server; to reach the dialog to manage servers (edit, remove, etc), it's necessary to first open that dialog and then click Cancel.

This is unintuitive and a UX gap, see for instance #6042.

Proposed fix

Replace "Add custom MCP" with "Manage MCP servers", which opens the dialog with the list of servers. To add a new server, the user simply clicks "Add server" in that dialog.

Closes #6042

Maybe makes #6030 unnecessary.

[gemini-code-assist]

Code Review

This pull request removes the openToCreate prop from ChatMcpServersDialog and renames the "Add custom MCP" option to "Manage MCP servers". It also updates the dialog's open effect to reset to the list view by default. Feedback was provided to reset the view state when the dialog is closed rather than when it is opened, which prevents a brief visual flash of the previous state.

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[Imagineer99]

Tested and working as expected.