fix(context): Address a few small context bugs

[leeandher]

Depends on #72008 to avoid merge conflicts.

Fixes:

• Empty metadata no longer annotates text. E.g. context with key constructor would return a meta of {} because Object.constructor always exists. Now it checks if that meta object is empty, rather than if it exists.
• Custom context is no longer Title-Cased or Start Cased (to retain exactly what users send)
• Unknown browsers from showing a (?) icon in context cards
• Adds title to icons for legibility of smaller icons

todo

• Fix any failing tests
• Add a fix for icon sizing (e.g. samsung, ios devices)

[codecov]

Bundle Report

Changes will decrease total bundle size by 2.2kB ⬇️

Bundle name	Size	Change
app-webpack-bundle-array-push	27.89MB	2.2kB ⬇️

[codecov]

Codecov Report

Attention: Patch coverage is 54.28571% with 16 lines in your changes missing coverage. Please review.

Project coverage is 77.93%. Comparing base (79fff19) to head (909abea).

❗ Current head 909abea differs from pull request most recent head fd5d2df

Please upload reports for the commit fd5d2df to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #72013       +/-   ##
===========================================
+ Coverage   56.88%   77.93%   +21.05%     
===========================================
  Files        6564     6573        +9     
  Lines      292402   292626      +224     
  Branches    50469    50529       +60     
===========================================
+ Hits       166323   228065    +61742     
+ Misses     121334    58307    -63027     
- Partials     4745     6254     +1509     

Files	Coverage Δ
...tic/app/components/events/contexts/contextCard.tsx	75.00% <ø> (ø)
...tic/app/components/events/contexts/contextIcon.tsx	73.68% <100.00%> (+4.93%)	⬆️
...ponents/events/meta/annotatedText/valueElement.tsx	100.00% <100.00%> (ø)
static/app/components/events/contexts/utils.tsx	51.53% <54.54%> (ø)
.../app/components/events/contexts/platform/index.tsx	38.88% <38.88%> (ø)

... and 2026 files with indirect coverage changes

[leeandher]

@malwilley This is the issue since even though we're asking for a firefox logo, this line will resolve true because the unknown logo and firefox logo both resolve to this for tests. So in this test, the logo doesn't actually render any more, meaning i can't use a test id. I also couldn't find a way to override this but if you know of a better alternative that'd be great