Absorb the matrix-react-sdk repository (#28192)

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Co-authored-by: Florian Duros <florian.duros@ormaz.fr>
Co-authored-by: Kim Brose <kim.brose@nordeck.net>
Co-authored-by: Florian Duros <florianduros@element.io>
Co-authored-by: R Midhun Suresh <hi@midhun.dev>
Co-authored-by: dbkr <986903+dbkr@users.noreply.github.com>
Co-authored-by: ElementRobot <releases@riot.im>
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Co-authored-by: Michael Weimann <michaelw@matrix.org>
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.github/workflows/release_prepare.yml

@@ -12,11 +12,6 @@ on:
                 required: true
                 type: boolean
                 default: true
-            matrix-react-sdk:
-                description: Prepare matrix-react-sdk
-                required: true
-                type: boolean
-                default: true
             matrix-js-sdk:
                 description: Prepare matrix-js-sdk
                 required: true
@@ -25,9 +20,6 @@ on:
 jobs:
     prepare:
         runs-on: ubuntu-latest
-        env:
-            # The order is specified bottom-up to avoid any races for allchange
-            REPOS: matrix-js-sdk matrix-react-sdk element-web element-desktop
         steps:
             - name: Checkout Element Desktop
               uses: actions/checkout@v4
@@ -49,16 +41,6 @@ jobs:
                   fetch-depth: 0
                   fetch-tags: true
                   token: ${{ secrets.ELEMENT_BOT_TOKEN }}
-            - name: Checkout Matrix React SDK
-              uses: actions/checkout@v4
-              if: inputs.matrix-react-sdk
-              with:
-                  repository: element-hq/matrix-react-sdk
-                  path: matrix-react-sdk
-                  ref: staging
-                  fetch-depth: 0
-                  fetch-tags: true
-                  token: ${{ secrets.ELEMENT_BOT_TOKEN }}
             - name: Checkout Matrix JS SDK
               uses: actions/checkout@v4
               if: inputs.matrix-js-sdk
@@ -83,10 +65,6 @@ jobs:
               if: inputs.element-web
               run: |
                   git -C "element-web" merge origin/develop
-            - name: Merge React SDK
-              if: inputs.matrix-react-sdk
-              run: |
-                  git -C "matrix-react-sdk" merge origin/develop
             - name: Merge JS SDK
               if: inputs.matrix-js-sdk
               run: |
@@ -106,17 +84,6 @@ jobs:
                   check-name: draft
                   allowed-conclusions: success
 
-            - name: Wait for matrix-react-sdk draft
-              if: inputs.matrix-react-sdk
-              uses: t3chguy/wait-on-check-action@18541021811b56544d90e0f073401c2b99e249d6 # fork
-              with:
-                  ref: staging
-                  repo: element-hq/matrix-react-sdk
-                  repo-token: ${{ secrets.ELEMENT_BOT_TOKEN }}
-                  wait-interval: 10
-                  check-name: draft
-                  allowed-conclusions: success
-
             - name: Wait for element-web draft
               if: inputs.element-web
               uses: t3chguy/wait-on-check-action@18541021811b56544d90e0f073401c2b99e249d6 # fork