Fix addUser() -> addCredential() issue

[HunsupJung]

Type of Change

• WWST Certification Request
  • If this is your first time contributing code:
    • I have reviewed the README.md file
    • I have reviewed the CODE_OF_CONDUCT.md file
    • I have signed the CLA
  • I plan on entering a WWST Certification Request or have entered a request through the WWST Certification console at developer.smartthings.com
• Bug fix
• New feature
• Refactor

Checklist

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have verified my changes by testing with a device or have communicated a plan for testing
• I am adding new behavior, such as adding a sub-driver, and have added and run new unit tests to cover the new behavior

Description of Change

https://smartthings.atlassian.net/wiki/spaces/~110472138/pages/5677547579/Risk+Analysis+-+Matter+Door+Lock+Capability+Transition+with+API+Partners#6.-Business-Impact-on-the-API-Partner-Program

Summary of Completed Tests

[github-actions]

Channel deleted.

[github-actions]

matter-lock_coverage.xml

File	Coverage
All files	90%	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/matter-lock/src/unmigrated-matter-lock/init.lua	92%	✅
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/matter-lock/src/lock_utils.lua	89%	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/matter-lock/src/lazy_load_subdriver.lua	57%	❌
/home/runner/work/SmartThingsEdgeDrivers/SmartThingsEdgeDrivers/drivers/SmartThings/matter-lock/src/init.lua	90%	✅

Minimum allowed coverage is 90%

Generated by 🐒 cobertura-action against 21b224b

[github-actions]

Test Results

   73 files  ±0    541 suites  ±0   0s ⏱️ ±0s
3 265 tests ±0  3 265 ✅ ±0  0 💤 ±0  0 ❌ ±0 
5 254 runs  ±0  5 254 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 21b224b. ± Comparison against base commit 71bbd3d.

[hcarter-775]

I haven't tested this myself yet, though I do plan to see if this solves the issues with addUser I was seeing. Still, this changeset is small and clear enough in my opinion where this does nothing but strengthen the logic.

[hcarter-775]

addUser now works using the VDA as well 👍 .