Makefile: add coverage report for explaintest

[Defined2014]

What problem does this PR solve?

Issue Number: ref #44301

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @Defined2014. Thanks for your PR.

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[codecov]

Codecov Report

Merging #45930 (d0fd181) into master (0ac1bd7) will increase coverage by 0.0034%.
Report is 6 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #45930        +/-   ##
================================================
+ Coverage   73.3547%   73.3582%   +0.0034%     
================================================
  Files          1277       1280         +3     
  Lines        393395     394069       +674     
================================================
+ Hits         288574     289082       +508     
- Misses        86415      86547       +132     
- Partials      18406      18440        +34     

Flag	Coverage Δ
integration	78.1388% <ø> (?)
unit	73.3499% <ø> (-0.0048%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	85.0602% <ø> (+0.0243%)	⬆️
br	52.0312% <ø> (+0.0124%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, xhebox

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-09 05:40:08.877204844 +0000 UTC m=+91173.426220816: ☑️ agreed by xhebox.
• 2023-08-09 06:32:32.777249171 +0000 UTC m=+94317.326265158: ☑️ agreed by hawkingrei.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #45931.