Update sample data page UI when useUpdatedUX enabled

[wanglam]

Description

This PR is for updating the sample data page UI when useUpdatedUX enabled. It mainly includes below changes:

• Move data source selector to the top right to align with other pages
• Remove duplicate sample data title

Issues Resolved

#8312

Screenshot

Testing the changes

• Clone branch code and run yarn osd bootstrap --single-version ignore
• Add below configs in config/opensearch_dashboards.yml

savedObjects.permission.enabled: true
workspace.enabled: true
uiSettings:
  overrides:
    'home:useNewHomePage': true
opensearchDashboards.dashboardAdmin.users: ['admin']

• Run yarn start --no-base-path
• Login with admin user and enter a specific workspace
• Click "Sample data" in the left navigation
• The UI should be the same with above screenshot

Changelog

• feat: Update sample data page UI when useUpdatedUX enabled

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

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.

Project coverage is 64.14%. Comparing base (59200d0) to head (c732708).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/plugins/home/public/plugin.ts	0.00%	4 Missing ⚠️
...ublic/application/components/tutorial_directory.js	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8291   +/-   ##
=======================================
  Coverage   64.14%   64.14%           
=======================================
  Files        3743     3743           
  Lines       88833    88846   +13     
  Branches    13852    13852           
=======================================
+ Hits        56979    56992   +13     
  Misses      31239    31239           
  Partials      615      615           

Flag	Coverage Δ
Linux_1	30.07% <0.00%> (ø)
Linux_2	58.86% <ø> (ø)
Linux_3	40.36% <0.00%> (ø)
Linux_4	31.60% <78.26%> (+0.01%)	⬆️
Windows_1	30.08% <0.00%> (ø)
Windows_2	58.81% <ø> (ø)
Windows_3	40.36% <0.00%> (+<0.01%)	⬆️
Windows_4	31.60% <78.26%> (+0.01%)	⬆️

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[Hailong-am]

do we need this change for home page?