Show size units in the timeline for size profiles

[fqueze]

Example profile: https://share.firefox.dev/42Kf0Ju

[codecov]

Codecov Report

Attention: Patch coverage is 45.45455% with 48 lines in your changes missing coverage. Please review.

Project coverage is 85.74%. Comparing base (7f30744) to head (63ccd74).
Report is 44 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils/format-numbers.js	41.66%	25 Missing and 3 partials ⚠️
src/components/timeline/Ruler.js	32.14%	14 Missing and 5 partials ⚠️
src/profile-logic/committed-ranges.js	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5364      +/-   ##
==========================================
- Coverage   85.84%   85.74%   -0.10%     
==========================================
  Files         312      312              
  Lines       29827    29886      +59     
  Branches     8213     8246      +33     
==========================================
+ Hits        25605    25626      +21     
- Misses       3627     3660      +33     
- Partials      595      600       +5     

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[mstange]

I think this is cool idea. But I think it shouldn't be magically based on threads[0].samples.weightType - it's something that affects all threads and it should be explicitly set in the profile, for example inside profile.meta.