ci: add mirror kit releases

[nickolas-dimitrakas]

Background

• This PR is part of the release-flow PoC for mirroring kits from the monorepo and creating kit releases/artifacts from CI.

What Has Changed

• Added a Braze 12 xcodeproj setup in the monorepo aligned to mParticle-Braze naming.
• Created release-ecosystem-from-main.yml
• Created sdk-release-ecosystem-manual.yml
• Updated CI build settings to disable signing and ensure archives contain frameworks

Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• I have tested this locally.

Additional Notes

• Release flow remains in dry-run mode.

Reference Issue (For employees only. Ignore if you are an outside contributor)

• Closes https://go/j/934

[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.66 MB	1.66 MB	+N/A
Executable Impact	896 bytes	896 bytes	+N/A
XCFramework Size	5.47 MB	5.47 MB	+N/A

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (workstation/9.0-Release):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1788,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1704,"sdk_executable_impact_bytes":896,"xcframework_size_kb":5604}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1788,"with_sdk_executable_size_bytes":76360,"sdk_impact_kb":1704,"sdk_executable_impact_bytes":896,"xcframework_size_kb":5604}

[BrandonStalnaker]

Two small things in addition to James' comment.