REKDAT-164: Add workflows for security scans

[Zharktas]

Adds new workflow to run semgrep and dependency check for pull requests. Probably no need to run these periodically because we dependabot and various github tools to warn us about vulnerable dependencies when the issues arise.

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.10%. Comparing base (82ab98d) to head (05cccbc).
Report is 34 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #292   +/-   ##
=======================================
  Coverage   79.10%   79.10%           
=======================================
  Files          19       19           
  Lines        1723     1723           
  Branches        1        1           
=======================================
  Hits         1363     1363           
  Misses        360      360           

Flag	Coverage Δ
cdk	100.00% <ø> (ø)

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