chore: [IOBP-1927] Improved the CGN webview playground usability, added a default user agent

[Hantex9]

Short description

This PR introduces improvements to how the WebviewComponent handles user agent headers, as well as refactors the CGN landing playground to use a more robust source object for webview navigation. The main themes are enhanced webview header configuration and improved playground usability.

List of changes proposed in this pull request

• Added a getDefaultUserAgent function to set a platform-specific user agent string for webview requests, ensuring consistent identification across iOS, Android, and other platforms that CGN merchants will use.
• Edited the webview source prop to always include the correct User-Agent header, merging with any existing headers.
  Error handling improvements:
• Added a useEffect to reset error state when the webview source changes, preventing stale error messages when navigating to new URLs.
• Refactored the CGN landing playground to use a WebViewSourceUri object for navigation, simplifying state management and making header manipulation more explicit.
• Updated the playground to pass the new playgroundEnabled prop to the webview component, enabling enhanced testing features that allow merchants to check the error pages if the webview goes into error without showing the standard umbrella.

How to test

⚠️ It's important to test this implementation with the production environment, ensuring that for those merchants with a landing page discount, the webview with the page is displayed successfully.

[github-actions]

PR Title Validation for conventional commit type

✅ All good! PR title follows the conventional commit type.

[github-actions]

Jira Pull Request Link

This Pull Request refers to Jira issues:

• IOBP-1927

[codecov]

Codecov Report

❌ Patch coverage is 53.33333% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.09%. Comparing base (dbcb339) to head (8431623).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...tings/devMode/playgrounds/CgnLandingPlayground.tsx	0.00%	4 Missing ⚠️
ts/components/WebviewComponent.tsx	72.72%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7261   +/-   ##
=======================================
  Coverage   59.08%   59.09%           
=======================================
  Files        1764     1764           
  Lines       37362    37371    +9     
  Branches     8489     8491    +2     
=======================================
+ Hits        22077    22083    +6     
- Misses      15205    15221   +16     
+ Partials       80       67   -13     

Files with missing lines	Coverage Δ
ts/components/WebviewComponent.tsx	81.25% <72.72%> (-5.71%)	⬇️
...tings/devMode/playgrounds/CgnLandingPlayground.tsx	15.38% <0.00%> (ø)

... and 13 files with indirect coverage changes

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