Add serivce account requirement for tiflash pod while restore

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Timeline:

• 2024-11-26 03:19:44.220917849 +0000 UTC m=+520171.840572365: ☑️ agreed by Oreoxmt.
• 2024-11-26 06:44:53.062533235 +0000 UTC m=+532480.682187751: ☑️ agreed by csuzhangxc.