feat: Add Applitools in Cypress workflow

[geido]

SUMMARY

This PR adds a new Github workflow to enable visual regression testing against Cypress.

This is meant to be an initial test of the functionality and it only checks for a few main sections, including:

• Explore
• SqlLab
• Dashboard view
• Dashboard edit mode
• Dashboard and Chart lists

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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

[codecov]

Codecov Report

Merging #19734 (fabd5b6) into master (902ac05) will decrease coverage by 11.91%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #19734       +/-   ##
===========================================
- Coverage   66.27%   54.35%   -11.92%     
===========================================
  Files        1712     1712               
  Lines       63957    63957               
  Branches     6720     6720               
===========================================
- Hits        42390    34767     -7623     
- Misses      19859    27482     +7623     
  Partials     1708     1708               

Flag	Coverage Δ
hive	53.65% <ø> (ø)
mysql	?
postgres	?
presto	53.50% <ø> (ø)
python	57.70% <ø> (-24.77%)	⬇️
sqlite	?
unit	48.63% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/utils/dashboard_import_export.py	0.00% <0.00%> (-100.00%)	⬇️
superset/key_value/commands/upsert.py	0.00% <0.00%> (-89.59%)	⬇️
superset/key_value/commands/update.py	0.00% <0.00%> (-89.37%)	⬇️
superset/key_value/commands/delete.py	0.00% <0.00%> (-85.30%)	⬇️
superset/key_value/commands/delete_expired.py	0.00% <0.00%> (-80.77%)	⬇️
superset/dashboards/commands/importers/v0.py	15.62% <0.00%> (-76.25%)	⬇️
superset/databases/commands/test_connection.py	31.42% <0.00%> (-68.58%)	⬇️
superset/datasets/commands/update.py	25.88% <0.00%> (-68.24%)	⬇️
superset/datasets/commands/create.py	30.18% <0.00%> (-67.93%)	⬇️
superset/datasets/commands/importers/v0.py	24.03% <0.00%> (-67.45%)	⬇️
... and 265 more

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[geido]

Closing in favor of this #19956