feat: Add analytics metadata to Flashbar

[fralongo]

Description

Similar to 9c17527

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.84%. Comparing base (9c17527) to head (d4a7dcf).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2687      +/-   ##
==========================================
- Coverage   95.85%   95.84%   -0.01%     
==========================================
  Files         744      745       +1     
  Lines       20581    20596      +15     
  Branches     7015     6649     -366     
==========================================
+ Hits        19727    19741      +14     
- Misses        846      847       +1     
  Partials        8        8              

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[orangevolon]

Two questions about this line:

1. We defined GeneratedAnalyticsMetadataFlashbarDismiss interface but its only use case is in this line with Partial<...>. Why we don't just mark the label as optional?
2. Why we don't use a creator functions like the other cases? something like getDismissButtonAnalyticsMetadata which returns this type like others?

[fralongo]

Thank you for the comments:

1. The output the function that collects the metadata will have a label. We use this attribute here to override the action part of it, which would be a generic click. I prefer to keep the type aligned with the outcome of the processing, so that I can automatically generate documentation in the future.
2. More than 15 components are already instrumented, and I normally didn't need to create specific functions to collect the metadata. The Flashbar was an exception because of the double implementation (collapsible and non-collapsible. However, if you prefer I can create a function. Let me know.