Remove theme update modal

[abbyhu2000]

Description

Remove theme modal as we do not need it anymore.
Add the theme update modal PR: https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4715/files

Issues Resolved

Screenshot

Testing the changes

Changelog

• feat: Remove theme update modal

Check List

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.95%. Comparing base (70ab5be) to head (99777e9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9776   +/-   ##
=======================================
  Coverage   61.95%   61.95%           
=======================================
  Files        3826     3825    -1     
  Lines       92600    92589   -11     
  Branches    14752    14752           
=======================================
- Hits        57367    57361    -6     
+ Misses      31524    31519    -5     
  Partials     3709     3709           

Flag	Coverage Δ
Linux_1	28.88% <ø> (ø)
Linux_2	56.42% <ø> (ø)
Linux_3	39.60% <ø> (ø)
Linux_4	28.80% <ø> (-0.01%)	⬇️
Windows_1	28.90% <ø> (ø)
Windows_2	56.38% <ø> (ø)
Windows_3	39.61% <ø> (ø)
Windows_4	28.80% <ø> (-0.01%)	⬇️

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[Hailong-am]

Can you create a issue in functional test repo to make sure all cypress are still working? I remember there might have some setup to disable the model when doing cypress rest

[Hailong-am]

Can you create a issue in functional test repo to make sure all cypress are still working? I remember there might have some setup to disable the model when doing cypress rest

https://github.com/opensearch-project/opensearch-dashboards-functional-test/blob/bb3e06812d0d7bb24233a581e12063a9df9a2d06/cypress/integration/plugins/security-dashboards-plugin/readonly.js#L64-L65

the setting is set in local storage, it should be safe when we remove it from yml

[abbyhu2000]

opensearch-project/opensearch-dashboards-functional-test#1790 <-- PR to remove theme modal related code in cypress tests @ruanyl @Hailong-am