Add version validation

[lornakelly]

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https://github.ibm.com/compose/App/issues/1523

• Remove force new when version changes
• Validate the version on plan
• Notify customer they should update version to match remote

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Example of when db is changed on IBM side

Example of user trying to update minor version

Example of user trying to update major version