fix(stoneinteg-761): remove ephemeral environment metric

[kasemAlem]

Maintainers will complete the following section

Following to issue STONEINTG-761 ,
this PR is about removing a leftover ephemeral environment frmo integration grafana dashboard

• Commit messages are descriptive enough (hints)
• Code coverage from testing does not decrease and new code is covered (check the PR coverage on codecov)
• Controllers diagrams are updated when PR changes controllers code (if applicable)

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[hongweiliu17]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.59%. Comparing base (4ec2b4c) to head (e639adb).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #648      +/-   ##
==========================================
+ Coverage   72.52%   72.59%   +0.06%     
==========================================
  Files          46       46              
  Lines        4572     4572              
==========================================
+ Hits         3316     3319       +3     
+ Misses        908      905       -3     
  Partials      348      348              

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[dirgim]

LGTM