[O2B-1423] Uniformize QC flags to use qc_time_start/qc_time_end

[martinboulais]

I have a JIRA ticket

• branch and/or PR name(s) include(s) JIRA ID
• issue has "Fix version" assigned
• issue "Status" is set to "In review"
• PR labels are selected

Notable changes for users:

• N/A

Notable changes for developers:

• Simplify existing code for QC summary computation

Changes made to the database:

• N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.76%. Comparing base (aa10960) to head (c19af61).
Report is 14 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (aa10960) and HEAD (c19af61). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (aa10960)	HEAD (c19af61)
	15	13

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1867       +/-   ##
===========================================
- Coverage   44.44%   33.76%   -10.69%     
===========================================
  Files        1011     1011               
  Lines       16980    16984        +4     
  Branches     3052     3054        +2     
===========================================
- Hits         7547     5734     -1813     
- Misses       9433    11250     +1817     

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[martinboulais]

Close in favor of #1871