fix: Switching to local codecov script

[craig-rueda]

SUMMARY

In light of recent issues with the remote codecov bash script, this PR downloads the script locally and migrates CI actions to utilize the local script instead.

TEST PLAN

This should only affect CI, so passing workflows should suffice

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[etr2460]

lgtm, although i didn't review the bash script itself :P

perhaps we should also add instructions to the script's comment block on how to update in the future if needed?

[codecov]

Codecov Report

Merging #14170 (c87a170) into master (8ef572a) will increase coverage by 0.50%.
The diff coverage is 71.33%.

❗ Current head c87a170 differs from pull request most recent head 3064d6c. Consider uploading reports for the commit 3064d6c to get more accurate results

@@            Coverage Diff             @@
##           master   #14170      +/-   ##
==========================================
+ Coverage   79.07%   79.58%   +0.50%     
==========================================
  Files         943      945       +2     
  Lines       48353    47920     -433     
  Branches     6246     6067     -179     
==========================================
- Hits        38237    38136     -101     
+ Misses       9977     9660     -317     
+ Partials      139      124      -15     

Flag	Coverage Δ
hive	?
mysql	80.65% <69.33%> (-0.11%)	⬇️
postgres	?
presto	?
python	80.68% <69.33%> (-0.67%)	⬇️
sqlite	80.28% <69.33%> (-0.11%)	⬇️

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

Impacted Files	Coverage Δ
...end/src/SqlLab/components/RunQueryActionButton.tsx	64.28% <ø> (ø)
...-frontend/src/components/CronPicker/CronPicker.tsx	91.66% <ø> (ø)
...perset-frontend/src/components/CronPicker/index.ts	100.00% <ø> (ø)
...t-frontend/src/components/DropdownButton/index.tsx	24.00% <ø> (ø)
...rset-frontend/src/components/ErrorMessage/types.ts	100.00% <ø> (ø)
superset-frontend/src/components/Switch/index.tsx	100.00% <ø> (ø)
superset-frontend/src/views/CRUD/alert/types.ts	100.00% <ø> (ø)
...set-frontend/src/views/CRUD/welcome/ChartTable.tsx	77.08% <ø> (ø)
...frontend/src/views/CRUD/welcome/DashboardTable.tsx	63.63% <ø> (ø)
...-frontend/src/visualizations/presets/MainPreset.js	100.00% <ø> (ø)
... and 123 more

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