*: remove api mode

[rleungx]

What problem does this PR solve?

Issue Number: ref #8477.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 83.05085% with 10 lines in your changes missing coverage. Please review.

Project coverage is 75.89%. Comparing base (a86f3dd) to head (d380e36).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8780      +/-   ##
==========================================
- Coverage   76.17%   75.89%   -0.28%     
==========================================
  Files         458      458              
  Lines       70167    70197      +30     
==========================================
- Hits        53447    53275     -172     
- Misses      13365    13568     +203     
+ Partials     3355     3354       -1     

Flag	Coverage Δ
unittests	75.89% <83.05%> (-0.28%)	⬇️

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