feat!: Allow specifying MAYAPY exe via environment

[Ahuge]

This matches the logic we have implemented in the deadline-cloud-for-cinema-4d package.

What was the problem/requirement? (What/Why)

The assumption that the executable mayapy exists on the PATH doesn't always make sense, often it is easier to specify the version of MAYA to use by explicit path and using an environment variable is an easy way to do this for customers.

What was the solution? (How)

We have defined a new environment variable MAYAPY_EXECUTABLE which follows the naming from
deadline-cloud-for-cinema-4d of <EXE_NAME>_EXECUTABLE

What is the impact of this change?

Additional functionality to override the mayapy executable that is used via the environment variable.

Was this change documented?

Yes this was documented in the README.md similar to how it was done in the deadline-cloud-for-cinema-4d package

Is this a breaking change?

No

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[Ahuge]

Updated to use MAYA_ADAPTOR_MAYAPY_EXECUTABLE naming instead of MAYA_ADAPTOR_MAYAPY_EXE, which matches Nuke

[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

See analysis details on SonarQube Cloud

[Ahuge]

Updated to use MAYAPY_EXECUTABLE naming instead of MAYA_ADAPTOR_MAYAPY_EXE, after a conversation with Morgan and Mark