[sort-imports] update keyvault-secrets with respect to sort-imports rule

[bzhang0]

This PR is working in conjunction with other PRs to solve #9252.
As per my previous PR #18598, I will be making multiple PRs to fix individual sections of the azure codebase with respect to the new sort-imports rule.

In this PR, I have fixed all files under sdk/keyvault/keyvault-secrets.

[ghost]

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

[ghost]

Thank you for your contribution, bzhang0!

[bzhang0]

It seems I'm getting a lot of failed checks, which is likely due to some conflicts when I called git cherry-pick. I will revert back to a stable version and manually fix linter errors to avoid this.

[bzhang0]

I will be closing this as well. It seems that running rush build is inconsistent in terms of build errors. I ensured that the build ran properly before adjusting only the sort-imports warnings, but rush build still returns an error after doing this. I'll probably try doing different directories first, and making sure this error isn't for all parts of the repository.