refactor: set strictnullchecks = true

[rjbrache]

PR Checklist

• Unit Tests have been added for new changes
• API tests have been updated if applicable
• All commented code has been removed
• If you've added a dependency, you've ensured license is compatible with Apache 2.0 and clearly outlined the added dependency.

What are you changing?

Anything the reviewer should know when reviewing this PR?

If the there are associated PRs in other repositories, please link them here (i.e. open-amt-cloud-toolkit/repo#365 )

[codecov]

Codecov Report

Attention: 122 lines in your changes are missing coverage. Please review.

Comparison is base (ac3a957) 84.99% compared to head (b867fb1) 84.90%.

Files	Patch %	Lines
src/models/index.ts	0.00%	18 Missing ⚠️
src/stateMachines/activation.ts	78.94%	16 Missing ⚠️
src/ProfileManager.ts	60.60%	12 Missing and 1 partial ⚠️
src/stateMachines/ciraConfiguration.ts	89.18%	8 Missing ⚠️
src/stateMachines/unconfiguration.ts	96.25%	6 Missing ⚠️
src/certManager.ts	84.84%	5 Missing ⚠️
src/stateMachines/wiredNetworkConfiguration.ts	80.76%	5 Missing ⚠️
src/stateMachines/wifiNetworkConfiguration.ts	90.47%	4 Missing ⚠️
src/Index.ts	40.00%	3 Missing ⚠️
src/data/postgres/tables/ieee8021xProfiles.ts	80.00%	2 Missing and 1 partial ⚠️
... and 21 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1422      +/-   ##
==========================================
- Coverage   84.99%   84.90%   -0.09%     
==========================================
  Files         118      118              
  Lines        4304     4532     +228     
  Branches      789      979     +190     
==========================================
+ Hits         3658     3848     +190     
- Misses        597      631      +34     
- Partials       49       53       +4     

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[RosieAMT]

🎉 This PR is included in version 2.22.1 🎉

The release is available on:

• GitHub release
• v2.22.1

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