fix(crashlytics): resolve SPM run script for Flutter 3.44+ and custom -derivedDataPath

[phuongta-pi]

Description

Fixes #443.

flutterfire configure injects an Xcode Run Script Build Phase that spawns firebase-ios-sdk/Crashlytics/run to upload dSYMs. With Swift Package Manager the binary lives at <derivedDataPath>/SourcePackages/checkouts/firebase-ios-sdk/Crashlytics/run, but the previous implementation hardcoded a regex that only matches Xcode's standalone DerivedData layout:

DERIVED_DATA_PATH=$(echo "$BUILD_ROOT" | sed -E 's|(.*DerivedData/[^/]+).*|\1|')

This breaks two real-world layouts:

1. Flutter 3.44+ project-local builds (flutter build ios) place SourcePackages under <project>/build/ios/SourcePackages/..., which contains no DerivedData/ segment — sed leaves BUILD_ROOT untouched and the spawned path doesn't exist (ProcessException: No such file or directory).
2. xcodebuild -derivedDataPath <custom> runs (e.g. fastlane gym with its per-run isolation directory) place SourcePackages under <custom>/SourcePackages/..., again no DerivedData/ segment.

Fix

Replace the regex with a resolve_spm_run_script helper that strips /Build/... from BUILD_DIR (then BUILT_PRODUCTS_DIR / BUILD_ROOT as fallbacks) to recover the derived-data root. Xcode build settings guarantee BUILD_DIR has the shape <derivedDataPath>/Build/... across all three layouts (Xcode standalone, Flutter project-local, custom -derivedDataPath), so the strip-based anchor is reliable everywhere the previous regex was, plus the two cases it missed.

Also fall back to exit 0 with a warning if no candidate run file exists, so a misconfigured project surfaces a clear message instead of killing the archive with ProcessException.

Type of Change

• ✨ feat -- New feature (non-breaking change which adds functionality)
• 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 refactor -- Code refactor
• ✅ ci -- Build configuration change
• 📝 docs -- Documentation
• 🗑️ chore -- Chore

Test plan

The existing integration test Validate flutterfire upload-crashlytics-symbols script is ran when building app (test/configure_test.dart:585) exercises the new resolver end-to-end via flutter build ios --simulator --debug after switching the project to SPM. On Flutter 3.44, that test reproduces #443 with the old regex (flutter build outputs to build/ios, not ~/Library/.../DerivedData/Runner-X) and passes with this fix.

Verified manually against all three layouts:

• Xcode standalone build (~/Library/Developer/Xcode/DerivedData/Runner-XXXXX)
• flutter build ios Flutter 3.44.0 (<project>/build/ios/SourcePackages/...)
• xcodebuild -derivedDataPath custom (fastlane gym per-run dir)

Allow edits by maintainers

• Edits from maintainers allowed.

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