[sort-imports] enforce sort-imports rule in identity-cache-persistence

[bzhang0]

This PR reinforces the changes made in #19067 by changing the subdirectory's linting rule to "sort-imports": "error".

This affects the directory under sdk/identity/identity-cache-persistence.

[ghost]

Thank you for your contribution bzhang0! We will review the pull request and get back to you soon.

[witemple-msft]

Thank you!

On the build failures: our Identity CI is having some trouble, and we're looking into it.

[bzhang0]

Thank you!

On the build failures: our Identity CI is having some trouble, and we're looking into it.

No worries at all! Thank you for your time :D

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