Add SM owned files to code owners

[Thomas-Avery]

Type of change

- [ ] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [X] Other

Objective

Add Secrets Manager owned files to code owners file.

Code changes

• .github/CODEOWNERS:
  Add Secrets Manager owned files to code owners file.

Before you submit

• Please add unit tests where it makes sense to do so

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (339f45e) 49.34% compared to head (6bd0cb8) 49.34%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #494   +/-   ##
=======================================
  Coverage   49.34%   49.34%           
=======================================
  Files         154      154           
  Lines        7373     7373           
=======================================
  Hits         3638     3638           
  Misses       3735     3735           

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[coltonhurst]

As discussed this looks good. Open to thoughts that @Hinton might have.