Remove useless MemoryService tests

[nelsitoPuglisi]

Goal

• Remove ActivityManager as it wasn't used in the tests.
• Remove tests that are just not testing production code.

Testing

Unit tests passing.

[nelsitoPuglisi]

• Move from MetadataUtils to Device #546
• Remove react_native_version from EnvelopeResource #517
• Populates EnvelopeResource #516
• Removes unused reference to ActivityManager from EmbraceMetadataService #515
• Remove useless MemoryService tests #514 👈
• master

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.36%. Comparing base (af3a090) to head (4c3ec09).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #514      +/-   ##
==========================================
+ Coverage   79.31%   79.36%   +0.04%     
==========================================
  Files         387      387              
  Lines       10563    10563              
  Branches     1571     1571              
==========================================
+ Hits         8378     8383       +5     
+ Misses       1551     1548       -3     
+ Partials      634      632       -2     

see 2 files with indirect coverage changes

[fractalwrench]

LGTM