fix: free viewmodel and prevent caching of page on back #2098
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GitHub Issue (If applicable): fixes: #2097
PR Type
What kind of change does this PR introduce?
What is the current behavior?
When navigating back both page instance and attached viewmodel are cached, and are used when navigating back to the same page
What is the new behavior?
Page and viewmodel are disposed, so the next back operation will cause new instance of page and viewmodel to be created
PR Checklist
Please check if your PR fulfills the following requirements:
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results.Other information
Internal Issue (If applicable):