Allow disabling tools when 'enable_all_context_servers = true' (#33536)

Closes https://github.com/zed-industries/zed/issues/33519

Release Notes:

- agent: Improved support for explicitly disabling individual tools when
`enable_all_context_servers` is true. (e.g. enable all tools except
XYZ).
bdf29bf76fPeter Tripp committed on 6/30/2025, 2:56:25 PM· committed by GitHubparent402c61c
1 file changedLine totals unavailable