Add env and clean_env for shell notification and probe

[haoel]

if set the clean_env:true, the EaseProbe won't pass the OS environment variables to the shell notification and probe. the default value is false

[codecov-commenter]

Codecov Report

Merging #136 (4f6e19d) into main (6f566db) will decrease coverage by 0.13%.
The diff coverage is 83.49%.

@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
- Coverage   91.70%   91.57%   -0.14%     
==========================================
  Files          43       42       -1     
  Lines        2834     2908      +74     
==========================================
+ Hits         2599     2663      +64     
- Misses        168      176       +8     
- Partials       67       69       +2     

Impacted Files	Coverage Δ
probe/common.go	100.00% <ø> (ø)
report/types.go	76.92% <ø> (ø)
probe/ssh/ssh.go	84.96% <66.66%> (ø)
report/result.go	90.62% <80.95%> (-2.24%)	⬇️
report/sla.go	92.81% <81.39%> (-1.63%)	⬇️
global/global.go	100.00% <100.00%> (ø)
probe/host/host.go	100.00% <100.00%> (ø)
probe/shell/shell.go	100.00% <100.00%> (ø)
daemon/daemon_windows.go

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[proditis]

Tested and reviewed
LGTM