Tweak version in conda

[peterfpeterson]

This allows for the tweak version to be set via conda as well as coded into cmake directly. There is also some minor cleanup as the tweak version is now more universally applied.

To test:

Run cmake with different values of PKG_VERSION injected and CONDA_BUILD turned on. The examples in the comment of VersionNumber.cmake are a good set as they cover all the options. Example:

PKG_VERSION="6.4.20220915.1529" cmake -D CONDA_BUILD=True .

will print Version: 6.4.20220915.1529 in the cmake configuration logs and look at the values in the templated file Framework/Kernel/src/MantidVersion.cpp that they are accurate.

There is no associated issue.

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Reviewer

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