rename sandbox-cli to ksctl

[MatousJobanek]

rename all occurrences of sandbox-cli to ksctl

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 65.28%. Comparing base (cdcbceb) to head (26cdd2f).

Files	Patch %	Lines
pkg/cmd/adm/setup.go	0.00%	2 Missing ⚠️
pkg/client/sandbox_config_file.go	0.00%	1 Missing ⚠️
pkg/cmd/adm/generate_cli_configs.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   65.28%   65.28%           
=======================================
  Files          38       38           
  Lines        1982     1982           
=======================================
  Hits         1294     1294           
  Misses        529      529           
  Partials      159      159           

Flag	Coverage Δ
unittests	65.28% <63.63%> (ø)

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[ranakan19]

Changes look good, need to make yaml linter happy