[skip-changelog] Set test environment directory as CLI WorkingDir

[MatteoPologruto]

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• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

What kind of change does this PR introduce?

Infrastructure Enhancement

What is the new behavior?

By default, the working directory is the one containing the test.go file. This causes problems when executing commands that have to create files specifically in the working directory, because they either must be deleted manually or the user has to be aware of it and defer a deleting instruction. Furthermore, it messes with tests using relative paths. Setting the environment directory as the CLI's WorkingDir prevents the above mentioned issues from occurring.

Does this PR introduce a breaking change, and is titled accordingly?

No

---

See how to contribute

[cmaglie]

>>> Running: ../../../arduino-cli core update-index
    arduino-cli.go:188: 
        	Error Trace:	/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/arduino-cli.go:188
        	            				/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/arduino-cli.go:150
        	            				/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/daemon_test.go:38
        	            				/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/daemon_compile_test.go:100
        	Error:      	Received unexpected error:
        	            	fork/exec ../../../arduino-cli: no such file or directory

Once you change the working directory we cannot start anymore the cli from a relative path like ../../../arduino-cli. You must obtain the absolute path before assigning it:

		ArduinoCLIPath:         FindRepositoryRootPath(t).Join("arduino-cli"),

probably the best way forward is to let FindRepositoryRootPath to return an absolute path.

[codecov]

Codecov Report

Base: 36.58% // Head: 36.66% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (12ea44c) compared to base (5730e2e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1886      +/-   ##
==========================================
+ Coverage   36.58%   36.66%   +0.08%     
==========================================
  Files         231      231              
  Lines       19696    19702       +6     
==========================================
+ Hits         7206     7224      +18     
+ Misses      11659    11650       -9     
+ Partials      831      828       -3     

Flag	Coverage Δ
unit	36.66% <100.00%> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/integrationtest/arduino-cli.go	85.66% <100.00%> (+0.31%)	⬆️
arduino/monitor/monitor.go	47.36% <0.00%> (+6.31%)	⬆️

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[MatteoPologruto]

>>> Running: ../../../arduino-cli core update-index
    arduino-cli.go:188: 
        	Error Trace:	/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/arduino-cli.go:188
        	            				/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/arduino-cli.go:150
        	            				/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/daemon_test.go:38
        	            				/home/runner/work/arduino-cli/arduino-cli/internal/integrationtest/daemon/daemon_compile_test.go:100
        	Error:      	Received unexpected error:
        	            	fork/exec ../../../arduino-cli: no such file or directory

Once you change the working directory we cannot start anymore the cli from a relative path like ../../../arduino-cli. You must obtain the absolute path before assigning it:

		ArduinoCLIPath:         FindRepositoryRootPath(t).Join("arduino-cli"),

probably the best way forward is to let FindRepositoryRootPath to return an absolute path.

It should be fixed now. Thanks for the suggestion!