Replace png with vectorized icons

[NotMyFault]

This PR replaces the png icons with vectorized icons looking less sharp/blurry on different scales.
https://issues.jenkins.io/browse/JENKINS-66946

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[uhafner]

Since which Jenkins LTS release are SVG icons allowed in those elements? Maybe we need to bump the minimum Jenkins version.

[codecov]

Codecov Report

Merging #342 (cba89bd) into master (e22348b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #342   +/-   ##
=========================================
  Coverage     50.04%   50.04%           
  Complexity      253      253           
=========================================
  Files            42       42           
  Lines          1093     1093           
  Branches         92       92           
=========================================
  Hits            547      547           
  Misses          510      510           
  Partials         36       36           

Impacted Files	Coverage Δ
...ns/plugins/forensics/miner/ForensicsJobAction.java	0.00% <ø> (ø)

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[NotMyFault]

2.289.1 contains the PR that adds the most sprites to core, but I'm not sure if was impossible to use svgs over pngs/gifs before.
To note, that is also the version the git plugin is using, which uses svg sprites in the build overview as well.