Fix local farm issues

[Alxiice]

Description

Fix issues on the local farm

• add script to launch/query the local farm
• add protections against using rez during tests

Fix a bug on the command generation inside the submitter.

[gemini-code-assist]

Code Review

This pull request introduces a new CLI launcher script (bin/meshroom_localfarm) for managing the local farm, enhances logging in localFarmBackend.py by adding task durations and single-quoting environment variables, and refactors REZ command wrapping in localFarmSubmitter.py. It also updates the test suite to isolate tests from the host's REZ environment and increases a timeout.

However, a critical issue was identified in localFarmSubmitter.py where prepending environment variables directly to the command before wrapping it with rez env will cause a runtime execution failure, as rez will incorrectly treat the first environment variable assignment as the executable command. A code suggestion has been provided to resolve this by prepending the environment variables to the outer command instead.

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[gemini-code-assist]

Prepending envVars directly to cmd before wrapping it with rez env will cause rez to treat the first environment variable assignment (e.g., VAR=VAL) as the executable command. This leads to a runtime error such as rez: Command failed: 'VAR=VAL' was not found or is not executable because rez env does not run the command in a shell by default.

To fix this, envVars should be prepended to the outer command (before rez env) so that they are set in the shell environment before rez is invoked. rez will then correctly inherit and propagate these variables to the resolved environment.

Suggested change

	envVars = " ".join([f'{k}="{v}"' for k, v in additionalEnv.items()])
	if envVars:
	cmd = f"{envVars} {cmd}"
	if rezBin:
	cmd = f"{rezBin} env {packagesStr} -- {cmd}"
	envVars = " ".join([f'{k}="{v}"' for k, v in additionalEnv.items()])
	if rezBin:
	cmd = f"{rezBin} env {packagesStr} -- {cmd}"
	if envVars:
	cmd = f"{envVars} {cmd}"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.07%. Comparing base (1d89d80) to head (40bfa05).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3169   +/-   ##
========================================
  Coverage    86.07%   86.07%           
========================================
  Files           78       78           
  Lines        12111    12111           
========================================
  Hits         10425    10425           
  Misses        1686     1686           

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