GH-47523: [C#] Remove csharp/ (#47547)

T### Rationale for this change

We've moved `csharp/` to https://github.com/apache/arrow-dotnet .

### What changes are included in this PR?

Remove `csharp/` and related files.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* GitHub Issue: #47523

Authored-by: Sutou Kouhei <[email protected]>
Signed-off-by: Raúl Cumplido <[email protected]>

Author: kou

.github/CODEOWNERS

@@ -33,9 +33,8 @@
 /cpp/src/arrow/engine @westonpace
 /cpp/src/arrow/flight/ @lidavidm
 /cpp/src/parquet @wgtmac
-/csharp/ @curthagenlocher
 /matlab/ @kevingurney @kou @sgilmore10
-/python/ @AlenkaF @raulcd @rok 
+/python/ @AlenkaF @raulcd @rok
 /python/pyarrow/_flight.pyx @lidavidm
 /python/pyarrow/**/*gandiva* @wjones127
 /r/ @jonkeane @thisisnic

.github/dependabot.yml

@@ -24,34 +24,3 @@ updates:
     commit-message:
       prefix: "MINOR: [CI] "
     open-pull-requests-limit: 10
-  - package-ecosystem: "gomod"
-    directory: "/swift/CDataWGo/"
-    schedule:
-      interval: "weekly"
-    commit-message:
-      prefix: "MINOR: [Swift] "
-    open-pull-requests-limit: 10
-  - package-ecosystem: "gomod"
-    directory: "/swift/data-generator/swift-datagen/"
-    schedule:
-      interval: "weekly"
-    commit-message:
-      prefix: "MINOR: [Swift] "
-    open-pull-requests-limit: 10
-  - package-ecosystem: "nuget"
-    directory: "/csharp/"
-    schedule:
-      interval: "weekly"
-    commit-message:
-      prefix: "MINOR: [C#] "
-    open-pull-requests-limit: 10
-    ignore:
-      - dependency-name: "Microsoft.Extensions.*"
-        update-types:
-          - "version-update:semver-major"
-      - dependency-name: "Microsoft.Bcl.*"
-        update-types:
-          - "version-update:semver-major"
-      - dependency-name: "System.*"
-        update-types:
-          - "version-update:semver-major"

.github/workflows/csharp.yml

@@ -25,11 +25,6 @@
   - any-glob-to-any-file:
     - c_glib/**/*
 
-"Component: C#":
-- changed-files:
-  - any-glob-to-any-file:
-    - csharp/**/*
-
 "Component: MATLAB":
 - changed-files:
   - any-glob-to-any-file:

.github/workflows/dev_pr/labeler.yml

@@ -32,7 +32,6 @@ on:
       - 'docker-compose.yml'
       - 'integration/**'
       - 'cpp/**'
-      - 'csharp/**'
       - 'format/**'
   pull_request:
     paths:
@@ -43,7 +42,6 @@ on:
       - 'docker-compose.yml'
       - 'integration/**'
       - 'cpp/**'
-      - 'csharp/**'
       - 'format/**'
 
 concurrency:

.github/workflows/integration.yml

@@ -305,9 +305,6 @@ repos:
           ?^ci/scripts/conan_build\.sh$|
           ?^ci/scripts/conan_setup\.sh$|
           ?^ci/scripts/cpp_test\.sh$|
-          ?^ci/scripts/csharp_build\.sh$|
-          ?^ci/scripts/csharp_pack\.sh$|
-          ?^ci/scripts/csharp_test\.sh$|
           ?^ci/scripts/download_tz_database\.sh$|
           ?^ci/scripts/install_azurite\.sh$|
           ?^ci/scripts/install_ccache\.sh$|

.pre-commit-config.yaml

@@ -43,7 +43,7 @@ Major components of the project include:
    Arrow data with application-defined semantics (for example a storage server or a database)
  - [C++ libraries](https://github.com/apache/arrow/tree/main/cpp)
  - [C bindings using GLib](https://github.com/apache/arrow/tree/main/c_glib)
- - [C# .NET libraries](https://github.com/apache/arrow/tree/main/csharp)
+ - [.NET libraries](https://github.com/apache/arrow-dotnet)
  - [Gandiva](https://github.com/apache/arrow/tree/main/cpp/src/gandiva):
    an [LLVM](https://llvm.org)-based Arrow expression compiler, part of the C++ codebase
  - [Go libraries](https://github.com/apache/arrow-go) `↗`