Test: Modify FindMKL.cmake (DO NOT CLOSE OR MERGE)

[sunliang98]

Reminder

• Have you linked an issue with this pull request?
• Have you added adequate unit tests and/or case tests for your pull request?
• Have you noticed possible changes of behavior below or in the linked issue?
• Have you explained the changes of codes in core modules of ESolver, HSolver, ElecState, Hamilt, Operator or Psi? (ignore if not applicable)

Linked Issue

Fix #...

Unit Tests and/or Case Tests for my changes

• A unit test is added for each new feature or bug fix.

What's changed?

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Any changes of core modules? (ignore if not applicable)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.15%. Comparing base (68735ed) to head (138a17e).
⚠️ Report is 487 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6649      +/-   ##
===========================================
+ Coverage    77.99%   83.15%   +5.15%     
===========================================
  Files         1114     1313     +199     
  Lines       103886   134748   +30862     
  Branches     14361        0   -14361     
===========================================
+ Hits         81028   112047   +31019     
- Misses       16966    22701    +5735     
+ Partials      5892        0    -5892     

Flag	Coverage Δ
unittests	83.15% <ø> (?)

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