Remove IE 11 support

[swaterkamp]

Checklist:

• [N/A] Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2399 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2399   +/-   ##
=======================================
  Coverage   54.89%   54.89%           
=======================================
  Files        1093     1093           
  Lines       26603    26603           
  Branches     7570     7538   -32     
=======================================
  Hits        14603    14603           
  Misses      10895    10895           
  Partials     1105     1105           

Impacted Files	Coverage Δ
gsa/src/gmp/capabilities/capabilities.js	100.00% <ø> (ø)
gsa/src/gmp/commands/policies.js	84.48% <ø> (ø)
gsa/src/gmp/commands/roles.js	33.33% <ø> (ø)
gsa/src/gmp/commands/scanconfigs.js	89.88% <ø> (ø)
gsa/src/gmp/gmp.js	80.00% <ø> (ø)
gsa/src/gmp/http/utils.js	33.33% <ø> (ø)
gsa/src/gmp/locale/lang.js	95.23% <ø> (ø)
gsa/src/gmp/locale/languages.js	100.00% <ø> (ø)
gsa/src/gmp/log.js	100.00% <ø> (ø)
gsa/src/gmp/models/alert.js	100.00% <ø> (ø)
... and 83 more

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