[Backport 2.x] [navigation] display workspace picker content when outside workspace and nav group

[opensearch-trigger-bot]

Backport 56fc8f4 from #7716.

[github-actions]

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[github-actions]

❌ Invalid Changelog Heading

The '## Changelog' heading in your PR description is either missing or malformed. Please make sure that your PR description includes a '## Changelog' heading with proper spelling, capitalization, spacing, and Markdown syntax.

[codecov]

Codecov Report

Attention: Patch coverage is 89.04110% with 16 lines in your changes missing coverage. Please review.

Project coverage is 64.28%. Comparing base (f64a270) to head (36b5097).
Report is 1 commits behind head on 2.x.

Files	Patch %	Lines
...chrome/ui/header/collapsible_nav_group_enabled.tsx	84.90%	0 Missing and 8 partials ⚠️
...public/chrome/ui/header/collapsible_nav_groups.tsx	87.09%	1 Missing and 3 partials ⚠️
src/core/public/chrome/ui/header/header.tsx	0.00%	0 Missing and 2 partials ⚠️
.../plugins/index_pattern_management/public/plugin.ts	66.66%	0 Missing and 1 partial ⚠️
...kspace_picker_content/workspace_picker_content.tsx	96.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x    #7882   +/-   ##
=======================================
  Coverage   64.27%   64.28%           
=======================================
  Files        3656     3658    +2     
  Lines       80742    80788   +46     
  Branches    12848    12864   +16     
=======================================
+ Hits        51897    51934   +37     
- Misses      25671    25672    +1     
- Partials     3174     3182    +8     

Flag	Coverage Δ
Linux_1	30.33% <27.27%> (+<0.01%)	⬆️
Linux_2	56.04% <86.91%> (+0.02%)	⬆️
Linux_3	40.71% <3.63%> (-0.01%)	⬇️
Linux_4	31.55% <5.45%> (-0.02%)	⬇️
Windows_1	30.35% <27.27%> (+<0.01%)	⬆️
Windows_2	55.99% <86.91%> (+0.02%)	⬆️
Windows_3	40.71% <3.63%> (-0.03%)	⬇️
Windows_4	31.55% <5.45%> (-0.02%)	⬇️

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