* .NET & python SDKs parity for bad pulumi versions
They handle invalid Pulumi CLI version gracefully.
* Make python version property lazy
* Clarify .NET logic
* Add python test for validate_pulumi_version
* Add tests for invalid versions
* Fix python test
* Fix typo
* Fix tests
* Have _validate_pulumi_version handle parsing
* Modify python and .NET to parseAndValidate
* Modify typescript and go to parseAndValidate
* fix name
When calling l.GetEnvVars() to evaluate whether version checking should
be skipped because of variables passed into the workspace, they have not
yet been set. This commit modifies the logic to look at the environment
variables in the options instead of in the workspace.
Since the original functionality has not yet been released, I do not
believe it warrants a CHANGELOG entry.
