[tests] Fix test_submit when launched through a rez env

[Alxiice]

Description

When we launched the test_submit test from a rez env we have a Compatibility issue error :

• the test registers the submitters
• the local farm submitter is initialized
• we list local packages
• if we are on a rez env then we will wrap all commands with rez

Then when the task launches :

• before the task, the farm sets the MESHROOM_PLUGINS_PATH
• But when the command executes, it starts with a rez env command
• If one of the packages in the env have a env.MESHROOM_PLUGINS_PATH.append(...) then it starts by resetting the MESHROOM_PLUGINS_PATH env variable, and we loose the content that we set here from the farm process.

Fix

The way I fixed the issue is by resetting rez variables before the test process, and therefore when the submitter is registered in the test, tasks are created without rez. And then, we have the correct value for MESHROOM_PLUGINS_PATH and the test succeeds.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.47%. Comparing base (b55440c) to head (2b8435f).
⚠️ Report is 3 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3078   +/-   ##
========================================
  Coverage    83.47%   83.47%           
========================================
  Files           81       81           
  Lines        10300    10301    +1     
========================================
+ Hits          8598     8599    +1     
  Misses        1702     1702           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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