Send warning and error alerts correctly

[somtochiama]

This pull requests sends alerts for severity warn when waiting on manual confirmation AND when the analysis fails.
It sends alerts with severity error only when the analysis fails.

Closes #1072

Signed-off-by: Somtochi Onyekwere somtochionyekwere@gmail.com

[codecov-commenter]

Codecov Report

Merging #1105 (9796903) into main (7071d42) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1105   +/-   ##
=======================================
  Coverage   57.23%   57.23%           
=======================================
  Files          78       78           
  Lines        6342     6342           
=======================================
  Hits         3630     3630           
  Misses       2171     2171           
  Partials      541      541           

Impacted Files	Coverage Δ
pkg/controller/events.go	52.89% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7071d42...9796903. Read the comment docs.

[stefanprodan]

LGTM

Thanks @somtochiama