Add Git commit id in jar manifest

[vpaturet]

Summary

Add the Git commit id in the application jar manifest (this ends up in the OTP shaded jar manifest as well)
This is useful when testing snapshot versions.
The new entry looks like:
SCM-Revision: 42e77fa2883aecbec36185ebd22f1a70e1424b86

Issue

No

Unit tests

No

Documentation

No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.85%. Comparing base (4198bb6) to head (735c525).

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #6346   +/-   ##
==========================================
  Coverage      69.85%   69.85%           
  Complexity     17926    17926           
==========================================
  Files           2035     2035           
  Lines          76508    76508           
  Branches        7825     7825           
==========================================
+ Hits           53442    53444    +2     
  Misses         20325    20325           
+ Partials        2741     2739    -2     

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