Improve span timoeut handling in BugsnagNativeSpansPlugin

[yousif-bugsnag]

Goal

Improves the handling of span timoeut timers in BugsnagNativeSpansPlugin

• Ensure that span references and associated timers are removed when the tracked span is overwritten by a new span with the same name.
• Fixes a memory leak related to the usage of NSTimer for handling span timeouts in BugsnagNativeSpansPlugin

Design

the NSTimer based span timeout timers were occasionally not firing for some tracked spans (network spans) that are not ended, due to run loop issues. This was causing memory leaks due to timeout timers not firing being removed. This PR switches to using GCD for span timeout timers, which avoids the issue and also has lower overheads

In addition, span timeout timers for a given span are now removed if a new span with the same name is started, avoiding holding references to untracked spans unnecessarily

Testing

Tested manually

[github-actions]

Browser bundle size

NPM build

	Package
Before	233.49 kB
After	233.49 kB
±	No change

CDN build

	Unminified	Minfied	Minified + gzipped
Before	118.26 kB	45.69 kB	13.19 kB
After	118.26 kB	45.69 kB	13.19 kB
±	No change	No change	No change

Code coverage

Coverage values did not change👌.

Total:

Lines	Branches	Functions	Statements
84.45%(+0%)	62.23%(+0%)	75.18%(+0%)	81.35%(+0%)

Generated against faa96e5 on 4 August 2025 at 13:28:33 UTC

[lemnik]

LGTM