do not return the erorr when ping fails in v1 dgo API

[mangalaman93]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the API version flag used in the Dgraph client to reflect the use of the v1 dgo API rather than the now-unused v24 API, and adjusts the ping handling logic accordingly.

• Renamed all instances of "useV24" to "useV1".
• Updated the ping method to determine which API to use based on the server’s support.
• Modified the signInUser and doWithRetryLogin functions to rely on the updated v1 flag.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
ns_v25.go	Changed flag condition from d.useV24 to d.useV1 in retry login logic.
client_v25.go	Updated signInUser condition and ping logic to reflect the new v1 usage.
client.go	Renamed the internal flag from useV24 to useV1 and updated its initialization.

Comments suppressed due to low confidence (1)

client_v25.go:284

• [nitpick] The use of the d.useV1 flag is slightly counterintuitive since a successful ping sets it to false. Consider renaming the flag or adding a clarifying comment to indicate that 'false' indicates the preferred API is available.

// By default, we assume the server is using v1 API