Dual-run sentry-react-native CI on Bitrise and Cirrus

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Set up dual-run workflows for sentry-react-native on both Bitrise and Cirrus. Also reduced job counts by moving some iOS jobs to GitHub Actions.

Related PRs:

• chore(ci): Run macOS workflows for on both Cirrus and Bitrise runners sentry-react-native#6274 — Run macOS workflows on both Cirrus and Bitrise runners
• chore(ci): Move sample app iOS build jobs to GitHub Actions runners sentry-react-native#6356 — Move sample app iOS build jobs to GitHub Actions runners
• chore(ci): Move testflight and size-analysis iOS jobs to GitHub Actions macos-26 sentry-react-native#6355 — Move testflight and size-analysis iOS jobs to GHA macos-26
• fix(ci): Skip Java, Gradle, and replay-stubs for iOS E2E jobs sentry-react-native#6353 — Skip Java, Gradle, and replay-stubs for iOS E2E jobs

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COCOA-1587