Delay codecov report until most of CI is done

[seladb]

When a PR is running codecov always shows as failing until enough reports are being uploaded.
This PR should fix it.

NOTE: we currently have 18 jobs, but report uploads sometimes fail so setting the threshold to 16

Here are a few references:
https://docs.codecov.com/docs/notifications#preventing-notifications-until-after-n-builds
https://community.codecov.com/t/github-status-notification-isnt-delayed-should-wait-all-ci-jobs-to-finish/3708/9

[codecov]

Codecov Report

Merging #1203 (0947730) into dev (6e2e88e) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #1203      +/-   ##
==========================================
- Coverage   81.67%   81.63%   -0.05%     
==========================================
  Files         157      157              
  Lines       20180    20180              
  Branches     7624     7624              
==========================================
- Hits        16483    16473      -10     
- Misses       3073     3086      +13     
+ Partials      624      621       -3     

Flag	Coverage Δ
alpine317	68.53% <ø> (ø)
centos7	71.91% <ø> (-0.01%)	⬇️
fedora37	68.36% <ø> (ø)
macos-11	0.00% <ø> (-60.04%)	⬇️
macos-12	0.00% <ø> (-60.16%)	⬇️
macos-ventura	60.11% <ø> (ø)
mingw32	68.75% <ø> (ø)
mingw64	68.77% <ø> (ø)
npcap	82.09% <ø> (-0.02%)	⬇️
ubuntu1804	72.13% <ø> (ø)
ubuntu2004	68.31% <ø> (-0.90%)	⬇️
ubuntu2204	68.14% <ø> (ø)
ubuntu2204-icpx	59.16% <ø> (ø)
unittest	81.63% <ø> (-0.05%)	⬇️
windows-2019	82.10% <ø> (-0.02%)	⬇️
windows-2022	82.12% <ø> (ø)
winpcap	82.09% <ø> (+0.01%)	⬆️
zstd	71.94% <ø> (ø)

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see 23 files with indirect coverage changes