cloud: small fix for iam and msp

[ran-huang]

What is changed, added or deleted? (Required)

use IAM instead of api key for api references

Which TiDB version(s) do your changes apply to? (Required)

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• master (the latest development version)
• v7.6 (TiDB 7.6 versions)
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Do your changes match any of the following descriptions?

• Delete files
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• Might cause conflicts after applied to another branch

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-18 06:21:23.116415681 +0000 UTC m=+423324.680713380: ☑️ agreed by hfxsd.

[ran-huang]

/approve

[ti-chi-bot]

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