Fixes some issues with preserving state while view swapping

[Tyler-Keith-Thompson]

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[Tyler-Keith-Thompson]

While @Richard-Gist and I were working on marketing stuff we discovered a couple of issues with SwiftCurrent_SwiftUI. This PR addresses those issues.

NOTE: The issue of removing the cached content when .persistence(.removedAfterProceeding) is untestable as far as @Richard-Gist and I could tell. ViewInspector simply cannot get into the correct lifecycle methods to validate it.

[codecov-commenter]

Codecov Report

Merging #114 (c840ecb) into main (568758f) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   93.98%   94.13%   +0.14%     
==========================================
  Files          75       75              
  Lines        1813     1823      +10     
==========================================
+ Hits         1704     1716      +12     
+ Misses        109      107       -2     

Impacted Files	Coverage Δ
...rces/SwiftCurrent_SwiftUI/Views/WorkflowItem.swift	93.51% <100.00%> (+1.85%)	⬆️
.../SwiftCurrent_SwiftUI/Views/WorkflowLauncher.swift	100.00% <100.00%> (ø)

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[Richard-Gist]

We've already talked that the other scenario fixed is not testable at this time with the tools that we have.