Bug Fix: Data Diagnosis - Fix bug of failure test and warning of pandas in data diagnosis

[yukirora]

Description
Fix bug of failure test and warning of pandas in data diagnosis.

Major Revision

• fix warning of pandas in replace and fillna due to type downcast
• fix bug of failure check function only check one matched metric rather than all matched metrics
• fix bug when converting regex into str of metrics when there're more than one match group

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.78%. Comparing base (46a5792) to head (fb4b480).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #638   +/-   ##
=======================================
  Coverage   85.78%   85.78%           
=======================================
  Files          97       97           
  Lines        6921     6923    +2     
=======================================
+ Hits         5937     5939    +2     
  Misses        984      984           

Flag	Coverage Δ
cpu-python3.6-unit-test	71.61% <100.00%> (+<0.01%)	⬆️
cpu-python3.7-unit-test	71.61% <100.00%> (+<0.01%)	⬆️
cpu-python3.8-unit-test	71.64% <100.00%> (+<0.01%)	⬆️
cuda-unit-test	83.87% <100.00%> (+<0.01%)	⬆️

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