fix: get source pkg from installed nevra for unfixed cves

[psegedy]

we need to get source package from installed nevra not just from installed package name.
We are showing false positive unfixed cves for packages built from different sources. E.g. bpftool is built from kernel and kernel-rt source packages and we are showing the CVE reported for kernel-rt when regular kernel is used which is incorrect (CVE-2022-0516 for bpftool-0:4.18.0-553.30.1.el8_10.x86_64)

[jira-linking]

Commits missing Jira IDs:
dedafda
262f62d
Referenced Jiras:
https://issues.redhat.com/browse/RHINENG-14565

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 59.25926% with 11 lines in your changes missing coverage. Please review.

Project coverage is 60.54%. Comparing base (86f6b90) to head (262f62d).
Report is 85 commits behind head on main.

Files with missing lines	Patch %	Lines
vmaas/vulnerabilities.go	59.25%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   56.74%   60.54%   +3.80%     
==========================================
  Files          11       15       +4     
  Lines        2062     2281     +219     
==========================================
+ Hits         1170     1381     +211     
+ Misses        838      817      -21     
- Partials       54       83      +29     

Flag	Coverage Δ
unittests	60.54% <59.25%> (+3.80%)	⬆️

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