fix(ksm): handle duplicate secrets with the same uid

[robbert229]

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Keeper Secrets Manager can return multiple records with the same uid. This is because KSM is now returning a secret for each time a secret is referenced. This breaks previous assumptions.

Description

Removing previous ksm sanity check ensuring a record is only returned once, and added supporting tests.

Checklist

Please make sure that your PR fulfills the following requirements:

• [x] Reviewed the guidelines for contributing to this repository
• [x] The commit message follows the Conventional Commits Guidelines.
• [x] Tests for the changes have been updated
• [x] Are you adding dependencies? If so, please run go mod tidy -compat=1.21 to ensure only the minimum is pulled in.
• [x] Docs have been added / updated
• [ ] Optional. My organization is added to USERS.md.

Type of Change

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] New tests
• [ ] Build/CI related changes
• [ ] Documentation content changes
• [ ] Other (please describe)

Other information

I implemented the original keeper secrets manager functionality back in #468.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.57%. Comparing base (42a43f0) to head (c355157). Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #652      +/-   ##
==========================================
- Coverage   72.16%   71.57%   -0.59%     
==========================================
  Files          26       29       +3     
  Lines        1994     2600     +606     
==========================================
+ Hits         1439     1861     +422     
- Misses        458      588     +130     
- Partials       97      151      +54     

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