Add explicit field_mask to Data Connect getConnector call

[fredzqm]

Updated getConnector in src/dataconnect/client.ts to explicitly specify the fields parameter ("name,source"), resolving an issue where the get call for Connectors used the default * instead of detailing the required fields explicitly.

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PR created automatically by Jules for task 4339466892693943361 started by @fredzqm

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[gemini-code-assist]

Code Review

This pull request updates the getConnector function in src/dataconnect/client.ts to limit the returned fields to "name,source" using query parameters. The reviewer pointed out that this restriction will omit other fields defined in the types.Connector interface, such as client_cache, which may be required by callers of this function. They suggested including client_cache in the fields mask to prevent potential issues.

[gemini-code-assist]

The types.Connector interface (defined in src/dataconnect/types.ts) includes a client_cache field. By explicitly limiting the fields query parameter to "name,source", the client_cache field (and potentially other fields like createTime or updateTime from BaseResource) will be omitted from the response. If these fields are needed by any callers of getConnector, they should be included in the fields mask.

Suggested change

	fields: "name,source",
	fields: "name,source,client_cache",