[Refactor] Merge raycluster_gcs_ft_test.go and raycluster_gcsft_test.go

[MortalHappiness]

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Description

Merge raycluster_gcs_ft_test.go and raycluster_gcsft_test.go in ray-operator/test/e2e/.

Use case

No response

Related issues

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[LeoLiao123]

Hi @MortalHappiness may I take this issue?