Adjust `mechanism` in `browser` SDK

[Lms24]

• globalHandlers: ref(browser): Adjust mechanism.type in globalHandlersIntegration #17299
• browserApiErrors: ref(browser): Set more descriptive mechanism.type in browserApiErrorsIntergation #17251
• httpCient: ref(browser): Add more specific mechanism.type to errors captured by httpClientIntegration #17254

[linear]

JS-798 Adjust `mechanism` in `browser` SDK