Update SDK inter-branch merge flow: drop 10.0.2xx and introduce 10.0.4xx

[Copilot]

github-merge-flow.jsonc still routed 10.0 servicing merges through release/10.0.2xx, which is now out of support. This update redefines the 10.0 path to flow 1xx -> 3xx -> 4xx -> main.

• 10.0 branch routing updates

  • Changed release/10.0.1xx target from release/10.0.2xx to release/10.0.3xx.
  • Replaced the release/10.0.2xx mapping with release/10.0.3xx -> release/10.0.4xx.
  • Moved the mainline handoff to release/10.0.4xx -> main (previously release/10.0.3xx -> main).

• Resulting merge chain

  • release/10.0.1xx -> release/10.0.3xx -> release/10.0.4xx -> main

"release/10.0.1xx": { "MergeToBranch": "release/10.0.3xx" },
"release/10.0.3xx": { "MergeToBranch": "release/10.0.4xx" },
"release/10.0.4xx": { "MergeToBranch": "main" }

[Copilot]

Pull request overview

Updates the SDK’s inter-branch merge automation routing to remove the out-of-support release/10.0.2xx hop and introduce a new release/10.0.4xx handoff before merges reach main.

Changes:

• Reroutes release/10.0.1xx to merge into release/10.0.3xx (instead of release/10.0.2xx).
• Replaces the release/10.0.2xx -> release/10.0.3xx mapping with release/10.0.3xx -> release/10.0.4xx.
• Moves the main handoff to release/10.0.4xx -> main.

[marcpopMSFT]

/ba-g no build for json changes