Bundle Analysis: Add metric label for upload result

[JerrySentry]

Will use the "result" label in Grafana to look at error rates.

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Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. In 2022 this entity acquired Codecov and as result Sentry is going to need some rights from me in order to utilize my contributions in this PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

[seer-by-sentry]

✅ Sentry found no issues in your recent changes ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.33%. Comparing base (f6fcffa) to head (5a50650).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1255   +/-   ##
=======================================
  Coverage   96.32%   96.33%           
=======================================
  Files         492      492           
  Lines       16890    16900   +10     
=======================================
+ Hits        16270    16280   +10     
  Misses        620      620           

Flag	Coverage Δ
unit	96.33% <100.00%> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ OperationalError: connection to server at "prod-timescaledb.codecov.dev" (10.25.32.2), port 5432 failed: Connection timed out /upload/bundle_analysis/v1 View Issue
• ‼️ OperationalError: SSL SYSCALL error: EOF detected /upload/bundle_analysis/v1 View Issue
• ‼️ OperationalError: server closed the connection unexpectedly /upload/bundle_analysis/v1 View Issue

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