[Data Explorer] Adds toggle between legacy and new discover

[ashwin-pc]

Description

Adds toggle between Discover 2.0 and Legacy Discover

Issues Resolved

Screenshot

Screen.Recording.2023-07-13.at.12.05.18.AM.mov

Testing the changes

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

Merging #4563 (a1d1270) into feature/data-explorer (d4ce533) will not change coverage.
The diff coverage is 40.00%.

@@                  Coverage Diff                   @@
##           feature/data-explorer    #4563   +/-   ##
======================================================
  Coverage                  66.52%   66.52%           
======================================================
  Files                       3280     3280           
  Lines                      62700    62700           
  Branches                    9766     9766           
======================================================
  Hits                       41713    41713           
  Misses                     18619    18619           
  Partials                    2368     2368           

Flag	Coverage Δ
Linux	66.47% <40.00%> (+<0.01%)	⬆️
Windows	66.47% <40.00%> (ø)

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

Impacted Files	Coverage Δ
src/plugins/discover/public/index.ts	0.00% <ø> (ø)
src/plugins/discover/public/plugin.ts	1.36% <0.00%> (ø)
.../data_explorer/public/components/app_container.tsx	33.33% <50.00%> (ø)
src/plugins/discover/common/index.ts	100.00% <100.00%> (ø)