chore: add codecoverage badge to Readme

[biswassri]

Description

Adding a codecov badge to see the overall code coverage status of the repo

How Has This Been Tested?

Screenshot or short clip

Merge criteria

• You have read the contributors guide.
• Commit messages are meaningful - have a clear and concise summary and detailed explanation of what was changed and why.
• Pull Request contains a description of the solution, a link to the JIRA issue, and to any dependent or related Pull Request.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[biswassri]

/cc @grdryn @asanzgom

[zdtsw]

i am not against but also try to understand the reason behind this.

[biswassri]

i am not against but also try to understand the reason behind this.

Just a follow-up to #1492 to have a batch showing the overall code coverage status of the repo.

[biswassri]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 18.72%. Comparing base (4685177) to head (a7b2725).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1493   +/-   ##
=======================================
  Coverage   18.72%   18.72%           
=======================================
  Files         154      154           
  Lines       10282    10282           
=======================================
  Hits         1925     1925           
  Misses       8145     8145           
  Partials      212      212           

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[grdryn]

/lgtm

[openshift-ci]

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