update makefile with coverage cmd (vscode)

[juggler31]

Add coverage cmd to generate coverage file.
Need to be used with code coverage plugin on vscode

Description

Related Issue

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
• My commits are all using prefix convention (emoji + tag name) and references associated issues
• I added a label to the PR corresponding to the perimeter of my contribution
• The title of my PR mentionned the issue associated

[cypress]

Passing run #7627 ↗︎

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Details:

Merge 6e5957d into 46ad1bc...
Project: Geotrek-admin	Commit: 0056c4db2e ℹ️
Status: Passed	Duration: 02:08 💡
Started: Dec 6, 2023 2:54 PM	Ended: Dec 6, 2023 2:56 PM

Review all test suite changes for PR #3848 ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (46ad1bc) 98.34% compared to head (6e5957d) 98.34%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3848   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files         292      292           
  Lines       21932    21932           
=======================================
  Hits        21569    21569           
  Misses        363      363           

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