ci(NODE-6694): kerberos tests use secrets manager

[baileympearson]

Description

What is changing?

Kerberos tests use secrets manager.

Is there new documentation needed for these changes?

What is the motivation for this change?

Release Highlight

Fill in title or leave empty for no highlight

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[durran]

Also lint failure:

[2025/02/03 19:03:24.624]    37:7   error  'krb5Uri' is never reassigned. Use 'const' instead                                                                                                                          prefer-const
[2025/02/03 19:03:24.624]   221:48  error  Replace `/GSS·failure|UNKNOWN_SERVER|Server·not·found·in·Kerberos·database/` with `⏎··········/GSS·failure|UNKNOWN_SERVER|Server·not·found·in·Kerberos·database/⏎········`  prettier/prettier
[2025/02/03 19:03:24.624] ✖ 2 problems (2 errors, 0 warnings)
[2025/02/03 19:03:24.624]   2 errors and 0 warnings potentially fixable with the `--fix` option.

[durran]

Waiting on the rc0 of the shared library to get put up for the download failures.