Remove IE11 support for 21.04

[saberlynx]

What:

Backport #2399

Why:

How:

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2689 (158a085) into gsa-21.04 (34466a4) will increase coverage by 0.15%.
The diff coverage is 94.11%.

@@              Coverage Diff              @@
##           gsa-21.04    #2689      +/-   ##
=============================================
+ Coverage      53.71%   53.86%   +0.15%     
=============================================
  Files           1072     1073       +1     
  Lines          26223    26228       +5     
  Branches        7474     7468       -6     
=============================================
+ Hits           14086    14129      +43     
+ Misses         11019    10983      -36     
+ Partials        1118     1116       -2     

Impacted Files	Coverage Δ
gsa/src/gmp/capabilities/capabilities.js	100.00% <ø> (ø)
gsa/src/gmp/commands/policies.js	86.15% <ø> (ø)
gsa/src/gmp/commands/roles.js	33.33% <ø> (ø)
gsa/src/gmp/commands/scanconfigs.js	90.62% <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	95.12% <ø> (ø)
gsa/src/gmp/locale/languages.js	100.00% <ø> (ø)
gsa/src/gmp/log.js	100.00% <ø> (ø)
gsa/src/gmp/model.js	100.00% <ø> (ø)
... and 124 more

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