Redesign Manage SSH keys on cluster

[kgroschoff]

What this PR does / why we need it:
Redesign Manage SSH keys on cluster

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1326

Special notes for your reviewer:
/

Release note:

Redesign dialog to manage SSH keys on cluster

[codecov]

Codecov Report

Merging #1353 into master will decrease coverage by 0.03%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master    #1353      +/-   ##
==========================================
- Coverage   74.01%   73.97%   -0.04%     
==========================================
  Files         191      191              
  Lines        5583     5587       +4     
  Branches      498      500       +2     
==========================================
+ Hits         4132     4133       +1     
- Misses       1258     1261       +3     
  Partials      193      193

Impacted Files	Coverage Δ
...ter-details/edit-sshkeys/edit-sshkeys.component.ts	55.07% <28.57%> (-1.86%)	⬇️
src/app/shared/functions/generate-random-string.ts	84.61% <0%> (-15.39%)	⬇️
.../components/notification/notification.component.ts	84.44% <0%> (+4.44%)	⬆️

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[maciaszczykm]

/lgtm
/approve

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maciaszczykm

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• OWNERS [maciaszczykm]

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[kubermatic-bot]

LGTM label has been added.

Git tree hash: 26b4da665a0629d45a626155db8bada8c965ea63