Clean suspend time test (BugFix)

[fernando79513]

Description

We had several some tests with conflicting output files.
We have removed one unused test, and set coherent names for the attachment files.

Apart from the naming issues fixed in this PR, I think that all of these suspend tests could be simplified by:

• Merge suspend_single.log and suspend_single_times.log. Since suspend_single_times.log already includes the contents of suspend_single.log, we could just have one log file that included all the information and check the part that we are interested in. It seems that we are already doing that in some suspend tests
• Get rid of file checks inside the command:
  [ -e "$PLAINBOX_SESSION_SHARE"/suspend_single_times.log ] && sleep_time_check.py "$PLAINBOX_SESSION_SHARE"/suspend_single_times.log
  And just check if the file exists in the sleep_time_check.py script

We could tackle these in a follow-up PR or address them here if we consider that's the way to go.

Resolved issues

https://warthogs.atlassian.net/browse/CHECKBOX-1644

Documentation

Tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.01%. Comparing base (f31e3e9) to head (2e95292).
Report is 130 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1702   +/-   ##
=======================================
  Coverage   49.01%   49.01%           
=======================================
  Files         372      372           
  Lines       40348    40348           
  Branches     6817     6817           
=======================================
  Hits        19777    19777           
  Misses      19849    19849           
  Partials      722      722           

Flag	Coverage Δ
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[Hook25]

+1, we should really unify all those names